Lord Scythican wrote:
Just a quick shout out for people with Mucolid woes. I am making Tyrannocytes out of the newly released kit and using green stuff to replace the missing tentacles for the Mucolids. Stop by my WIP thread for some coverage:

http://www.dakkadakka.com/dakkaforum/posts/list/623573.page


If anyone needs help trying to pull this off just post a comment or question.




On topic...I can't wait to get that new Broodlord. I have a space hulk one and another converted from my bitz box, but the new one looks pretty rad.

rigeld2 wrote:


Yeah, that's good.

rigeld2 wrote:
40 dice (if you Rage, which is unlikely).
20 hits.
10 wounds.
3 failed saves.

And then next turn it's 20 dice, 10 hits, 5 wounds, 1 failed save.

The Tac squad (ignoring the sarge being different) will swing 7 times, wound 4 times, and you'll fail 3-4 saves. So on the charge with Rage (best case scenario) you'll tie or lose combat.

Yeah, that's good.

Solidcrash wrote:

rigeld2 wrote:
40 dice (if you Rage, which is unlikely).
20 hits.
10 wounds.
3 failed saves.

And then next turn it's 20 dice, 10 hits, 5 wounds, 1 failed save.

The Tac squad (ignoring the sarge being different) will swing 7 times, wound 4 times, and you'll fail 3-4 saves. So on the charge with Rage (best case scenario) you'll tie or lose combat.

Yeah, that's good.

Don't belive in computer brains, belive in Dice God!

My roll,

Solidcrash wrote:

rigeld2 wrote:
40 dice (if you Rage, which is unlikely).
20 hits.
10 wounds.
3 failed saves.

And then next turn it's 20 dice, 10 hits, 5 wounds, 1 failed save.

The Tac squad (ignoring the sarge being different) will swing 7 times, wound 4 times, and you'll fail 3-4 saves. So on the charge with Rage (best case scenario) you'll tie or lose combat.

Yeah, that's good.

Don't belive in computer brains, belive in Dice God!

My roll,

Solidcrash wrote:

Don't belive in computer brains, belive in Dice God!

My roll,

Spoletta wrote:
Hormagaunt:


Hormagaunts are usually seen as an alternative to the deep striking rippers as mandatory troops. Depending on your list composition of heavy hitters you may want those guys in.
Alternatively you can go out all out on Hgaunts and TGants and play an horde style list.
Following here is a list of things you want to consider when talking about Hgaunts:


1. Hormagaunts may look like a cheap troop, but they actually are not. Remember that nids have Tgants, rippers and Mucolids for a cheaper troop choice. Take these guys only if you have a real reason, if not then there are better mandatory troops.

2. Hormagaunts are fast. Not as fast as beasts or jump infantry, but for their cost they are indeed fast between fleet and leap. They will get into assault range by turn 2 many times.

3. Do not expect vanilla hormagaunts to provide damage, that is not their role. They will make a mess out of certain units, but that will not happen commonly.

With that said why would you take Hgaunts, what is their intended role? Well at this point it is necessary to distinguish between vanilla hormagaunts and upgraded hormagaunts.

Vanillla hormagaunts are the most commonly used and are great for screening, tarpitting, objective grabbing and assault linking.

1) Screening: Since the rule clarification that you don't need to be 25% covered by a model to get the cover save but a toe in a ripper will suffice, these guys became an interesting alternative to the more commonly used screeners. While they cost 25% more than Tgants, they will never risk to slow down your dakkafex/exocrine/whatever. At the same time they cost 16% less than gargoyles (and are obj sec). Remember to bring a shroud source with you when doing this, or the hormagaunts will be an even better target than a dakkafex for the bolters on a point per average wound basis.
2) Tarpitting: When tarpitting with nids it is either gargoiles or hormagaunts. Luckily both of them are really good at this. Gargoiles are better due to the jump infantry type and the blinding venom even if they cost more. If you want pure tarpitting go for them. Take hormagaunts if you also need them for their other roles.
3) Objective grabbing: Here the best are the deepstriking rippers. Cheaper, easier to hide and deepstriking. Hormagaunts are close second though, with the highest speed between our obj sec troops and an high model count for conga lining.
4) Assault linking: This is where Hgaunts are the best. Assault a model with a slaughter unit (Dimacherion, Carnifex, Toxicrene etc..) and at the same time multi assault that model and another unit with a unit of hormagaunts. You will get 2 benefits: first your hormagaunts will eat up the overwatch and secondly when that inital assaulted model gets slaughtered you force an harsh leadership check on the second unit while in meele with an high initiative unit. Remember that glancing and penetrating hits count for resolution and tanks are indeed the best initial targets for this maneuver. Hgaunts have fleet and high initiative for a low cost, which makes them better at this than Tgants and Gargoiles.

As you see they are not the best at anything but they are a good second choice for all of those roles, with the point 4 being an exception but it is an uncommon occurance (but can win games, keep an eye out for it). So if you need just mandatory troops or strongly need one role in particular skip Hgaunts. If you need an all round troop choice than can be spent in any of those roles then consider Hgaunts.


Upgraded Hormagaunts are almost never seen and there is a reson. They cost! For a 1W T3 6+ model they can get to ridiculous costs. That said:
a) If you need anti rear AV 10 and can't honestly get anything better then AG Hgaunts can be an option. They are fairly good at it, but will bleed points like mad when targeted.
b) If you expect to face high T targets like WKnights or Nurgle babies then consider Venom Hgaunts. If you can get them on their favorite target then they can get to tear jerking efficiency, if not they will again be point bleeders at the smallest sign of enemy fire.
c) Do not consider AG + Venom Gaunts. Never.

Grades: C (Vanilla Hormagaunts), D (Single upgrade Hgaunts) E (Double Upgrade Hormagaunts)

 Frozocrone wrote:
Oh wow, just had a glimpse of the Shield of Baal's Hive Fleet detachment. I am really interested in formations, but I can't get pictures of them at the moment. Only know the names are 'Skyblight Swarm', 'Skytyrant Swarm', 'Neural Node', 'Hypertoxic Node', 'Spore Field' and 'Skytide' (that last one is probably a combination of all five, much like DE Carnival of Pain).

Thoughts?

 Frozocrone wrote:
I have done one for Carnifexes. I followed a Green, Amber, Red system for weapons and biomorphs to say which ones would be most viable in a competitive setting. Proof reading/critique by others would be appreciated. I am happy to edit this post if people have suggestions or builds (or to completely re-write it )

I've not included Formations with Carnifexes in, I think they could have their own section within the OP.

Spoiler:

Carnifexes
Background
When one thinks of a Tyranid army, one of the first models to come to mind is the Carnifex. One of the most iconic Tyranid models to be in existance, especially in 4th edition where Carnifexes could also be taken in Elites. As fifth edition came out, they became redundant with the arrival of the new Trygon and lack of option to be taken as an Elite and slowly started to gather dust. Following the arrival of 6th edition, Carnifexes were hailed as one of the shining stars of the Codex, getting a notable points decrease as well as being able to take multiples in a brood, opening up Heavy Support options. As 7th edition rolled out they came to be the only Monstrous Creature in the Tyranid Codex that wasn't nerfed by the changes to Smash, making use of it's standard base 9 Strength to deal with anything that comes across its path.

Competitive Setting
A Carnifex Brood uses one of the Heavy Support slots in a Tyranid army. It follows a standard TMC statline, with WS3, BS3, T6 with a 3+ Armour Save. As it does not have the Synapse Creature special rule, it will revert to Instinctive Behaviour outside of Synapse, of which the Carnifex rolls on the Feed table. Where the Carnifex starts to differ is that it only has 4 Wounds, making it not as durable as other TMC's and is Initiative 2, meaning that it strikes at the same speed as the lowly Ork and is out sped by anything that isn't a Power Fist or equivalent. However, where it lacks in speed, it makes up for in sheer brutality, sporting 3 attacks at base S9. Combined with it's Living Battering Ram special rule that grants it D3 Hammer of Wrath attacks instead of one, this makes it one of the premier options that Tyranids have for opening AV13/14.

Melee Weapons
Scything Talons - Carnifexes come equipped with two pairs of Scything Talons. Although being nerfed, they do allow for customization of a Carnifex by exchanging a pair for Wargear upgrades.
For those that want to keep Carnifexes cheap, this is a good option.
Crushing Claws - Crushing Claws grants a Carnifex S10 in Close Combat (note, not for Hammer of Wrath), allowing it to Instant Kill T5 as well as giving it the Armourbane USR, making it more likely to Penetrate AV13-14.
For Carnifexes designed for vehicle hunting, this is a good option.

Monstrous Bio-Cannons
Twin-Linked Deathspitter - A Carnifex may replace one pair of Scything Talons with a TL Deathspitter, granting it three 18" TL shots at S5 AP5. This is not very good, especially when taken in context, it is outclassed by another Monstrous Biocannon.
This is a bad option.
Twin-Linked Devourer with Brainleech worms - A Carnifex may replace one pair of Scything Talons with a TL Devourer with Brainleech Worms, granting it six 18" TL shots at S6 AP-. This allows a Carnifex to be multi-purpose, wounding Infantry through number of shots, as well as Light Armour and in emergencies, ground based AA.
This is a good option.
Stranglethorn Cannon - A Carnifex may replace one pair of Scything Talons with a Stranglethorn Cannon, granting it one 36" shot at S6 AP5 Large Blast, Pinning Shot. The Stranglethorn Cannon may only be taken once per model and may not be taken with the Heavy Venom Cannon. This allows a Carnifex to act as a Infantry killer and support smaller Tyranids by potentially making it harder to shoot at them. However, with a Carnifexes bad Ballistic Skill, it might scatter off the target and is in general, outclassed by Biovores, who give three Large Blast Templates at a large ranger for the price of a standard Carnifex.
This is a bad option.
Heavy Venom Cannon - A Carnifex may replace one pair of Scything Talons with a Heavy Venom Cannon, granting it one 36" shot at S9 AP4 Blast. Only one Heavy Venom Cannon may be taken per model and may not be taken with the Stranglethorn Cannon. This allows a Carnifex to fire a single S9 shot before it charges a vehicle, making it easier to wreck vehicles, as well as Instant Killing T4. For Carnifexes designed for Vehicles-hunting, this could be the last glancing hit you need to wreck that vehicle.
This is a decent option.

Biomorphs
Toxin Sacs A Carnifex with Toxin Sacs has the Poisoned USR. This, combined with the natural S9 of the Carnifex, will normally allow it to re-roll failed to Wound rolls. However, the Carnifex only has 3 attacks base and WS3, meaning you might not get to make use of the re-roll to wounds.
This is a decent option.
Acid Blood A Carnifex with Acid Blood the ability to inflict a S5 AP2 hit per unsaved wound in Close Combat. This looks quite good, until you realise the Carnifex only has four Wounds, as well as the opponent having to take an Initiative before the hit can apply.
This is a bad option.
Adrenal Glands. A Carnifex with Adrenal Glands has the Fleet and Furious Charge USR. This allows a Carnifex to have S10 on the charge (note, not for Hammer of Wrath), as well as re-roll Run and Charge distances. This makes getting into combat much easier and combined with the Onslaught Psychic Power, allows Carnifexes to get into position quickly to start firing any Ranged Weapons they have.
This is a good option.
Regeneration. A Carnifex with Regeneration has the ability to regain lost wounds at the end of the game turn on a 4+. This looks promising, until one realizes it is the least durable Monstrous Creature that Tyranids have, on virtue of it having the fewest amount of Wounds (aside the Hive Tyrant, which can mitigate this with the Catalyst Psychic Power and Wings for a FMC profile) and only has a 3+ armour save coupled with it's Toughness characteristic of 6, meaning it can be focused fired down before it can make use of Regeneration.
This is a bad option.

Tail Biomorphs
Thresher Scythe - A Carnifex with a Thresher Scythe may make an additional S4 AP4 attack with the Rending special rule in close combat. Considering that the Carnifex that is in combat is usually geared for vehicle killing, this is not likely to help.
This is a bad option.
Bone Mace - A Carnifex with a Bone Mace may make an additional S8 AP - attack in close combat. They cost the same as Crushing Claws which will more reliably open vehicles, but if you feel that you are not destroying vehicles enough, it grants additional attack that may cause that final glancing hit.
This is a decent option.

Options
Additional Carnifexes - a Carnifex Brood may take up to two more Carnifexes. This allows a Tyranid player to shift Carnifexes around for Wound allocation purposes making the brood more durable, as well as have more Carnifexes without using up the Heavy Support slots. Any Carnifex brood consisting of two or three Carnifexes can not make use of the Tyrannocyte, making this option a speed vs durability argument.It is important to note however, that any Carnifex Brood with two or three models, are vulnerable to the harshest Instinctive Behaviour: Feed table.
For lists that do not use Tyrannocytes, or do not want Carnifexes using a Tyrannocyte, this is a good option.
For lists that do make use of Tyrannocytes, this is decent option.
Spine Banks - A Carnifex with Spine Banks may fire one 8" shot at S3 AP- Blast and is treated as having Assault Grenades. This is generally not worth it as the damage output is so low and Carnifexes have a low Initiative to begin with.
This is a bad option.
Bio-Plasma - A Carnifex with Bio=Plasma may fire one 12" shot at S7 AP2 Blast. This is better than Spine Banks as you can wound a lot more stuff. It is still a bit pricey however and for thirty points more, one can purchase an Exocrine, which has a larger blast or six shots at double the range and when stationary, a better BS.
This is a decent option.

Transport
Tyrannocyte As soon as the Tyrannocyte was announced, there was much rejoicing amongst Tyranid players. Tyrannocytes give much needed speed to Tyranids, which allows Carnifexes to move up even faster than before. Note that only one MC model can embark the Tyrannocyte upon deployment. Tyrannocytes work best when a model can immedietly do something upon deployment, such as shoot or provide Synapse so is not the best option for all Carnifexes.
For single Carnifexes with Ranged Weapons, this is a good option.
For single Carnifexes with Melee only weapons, this is a decent option.
For Carnifexes with long range weapons (HVC or SC) or broods of two or more models, this is a bad option.

Standard Competitive Builds
Carnifex w/ 2x TL Devourers with Brainleech Worms - can be taken alone to fit in a Tyrannocyte or in multiples for more firepower, this type of Carnifex, known as the 'Dakkafex' spits out a large number of shots which shave wounds off units. Adrenal Glands are an optional extra to allow it to more reliable deal with vehicles or move into position.
Carnifex w/ Scything Talons, Crushing Claws - This type of Carnifex commonly has two more standard Carnifexes for ablative wounds, as they move up the battlefield looking for the highest AV vehicles and destroying them with ease. Adrenal Glands are not a necessity as the Crushing Claws variant can reliably deal with high AV vehicles and you normally have ablative wounds for your Crushing Claws Carnifex.
Carnifex w/ 2x Scything Talons, Adrenal Glands - The 'Screamer-Killer' is a basic Carnifex. It can either be taken in multiples for more Wounds to chew through, or as a single unit

Stone Crusher Carnifexes
From Forge World, Stone Crusher Carnifexes are even stronger than regular Carnifexes, boasting S10 on their base statline. This becomes even better when you consider the fact they also have Living Battery Ram, as well as their own special rules, Wrecker, Sunder and Carapace Chitin-rams. This gives all Hammer of Wrath attacks Armourbane and Monster Hunter, meaning they can put wounds on MC and vehicles alike. Wrecker and Sunder is what really sets them apart from Carnifexes, they are allowed to re-roll all failed Armour Penetration rolls, as well as add one to the result if against immobile structures and fortifications (on top of the +2 granted by the Wrecker Claws AP1 value) when using their Wrecker Claws. Although the Stone Wrecker Carnifex has less attacks than the Carnifex (two compared to three) any attack that goes through is more than likely going to cause an Explodes! result. As a trade off for their close combat power, they have no access to Monstrous Biocannons.

While having an identical profile to the Carnifex (Trading an attack for Strength 10 aside), they are more durable then Carnifexes, due to their Reinforced Caraspace special rule, which makes any shooting attacks resolved against a Stone Crusher Carnifex reduce their Strength by one. Essentially, this means the Stone Crusher Carnifex is T7 against shooting attacks (note this does not apply to close combat attacks).

Stone Crusher Carnifexes upgrades
Additional Stone Crusher Carnifexes - like regular Carnifexes, additional Carnifexes may be taken for Wound allocation purposes. Considering that they are Toughness 7 against shooting attacks, this will prolong the life of Stone Crusher Carnifexes considerably. As mentioned in the Tyrannocyte entry for Carnifexes, models that can do something upon Deep Strike arrival are good. Stone Crusher Carnifexes have the durability to run up the field and bear the brunt of most weapons, especially with Shrouded support. Note that broads of two or more Stone Crusher Carnifexes are vulnerable to the worst result on the Instinctive Behaviour: Feed table.
For lists that do make use of Tyrannocytes, this is decent option.
For lists that do not use Tyrannocytes, or do not want Stone Wrecker Carnifexes using a Tyrannocyte, this is a good option.
Spine Banks - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bio-Plasma -Generally not worth it since a Stone Wrecker Carnifex does not want to be targetting Infantry.
This is a bad option.
Thresher Scythe - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bone Mace - Unlike regular Carnifexes, Stone Wrecker Carnifexes do not require help destroying vehicles.
This is a bad option.
Wrecker Claw and Bio-Flail - A Stone Wrecker Carnifex with a Wrecker Claw and Bio-Flail replaces their ability to re-roll amour penetration on their regular attacks with the ability to cause Instant Death and gain a new rule, Sweep Attack. Sweep Attack allows a model to replace all their attacks with a number of attacks equal to the number of enemy models in base contact with them. This allows a Stone Crusher Carnifex with a Wrecker Claw and Bio-Flail to generate more attacks and stops it being tarpitted as easily, while the trade off is that they may find it harder to destroy vehicles.
For Stone Crusher Carnifex broods consisting of two or three models, this is a good option.
For Stone Crusher Carnifex broods consisting of one model, this is a decent option.


Transport
Much like a regular Carnifex, a single Stone Crusher Carnifex can embark on a Tyrannocyte. However, a Stone Wrecker Carnifex has more durability than a regular Carnifex and can forgo a Transport in favour of running up. Note however, that a Stone Wrecker Carnifex can not usse Adrenal Glands at all, so it is still quite slow in that regard, meaning the Tyrannocyte can provide the speed that a Stone Wrecker Carnifex needs in order to do damage.
For single Stone Wrecker Carnifexes, this is a good option.
For Stone Wrecker Carnifex broods of two or more models, this is a bad option.

Standard Competitive Builds
Stone Wrecker Carnifex w/ Wrecker Claws - A standard Stone Wrecker Carnifex does a fine job of destroying vehicles without any upgrades.
Stone Wrecker Carnifex w/ Wrecker Claw and Bio-flail - A Stone Wrecker Carnifex with Wrecker Claw and Bio-flail should only be taken in groups of two or more, as it prevents a heavily points invested unit being tarpitted easily.

Conclusion and Overall Rating

Carnifex Overall rating = A-
The Carnifex can provide a lot for a Tyranid army that is not covered well within the rest of the army, such as high volumes of fire or dealing with AV13-14 and as such, are recommended in most builds of Tyranids. The Carnifex can be kitted out for different roles, making it a multi-purpose unit, which is useful in the case that you may not always be playing against vehicles. The Carnifex just falls short of being an all-star by a reliance on Synapse to function well, as well as requiring support from other Tyranids to provide it with a cover save, or to simply draw fire away from it as it is fragile in comparison to other TMCs.

Stone Crusher Carnifex Overall Rating = B
While the Stone Crusher Carnifex is the best answer Tyranids have to heavy vehicle duties, it's role is very linear and does not allow much adaptability. It also suffers from requiring Synapse to be effective and even with pseudo Toughness 7, is still quite vulnerable to volume of fire with only four wounds.

 Frozocrone wrote:
I have done one for Carnifexes. I followed a Green, Amber, Red system for weapons and biomorphs to say which ones would be most viable in a competitive setting. Proof reading/critique by others would be appreciated. I am happy to edit this post if people have suggestions or builds (or to completely re-write it )

I've not included Formations with Carnifexes in, I think they could have their own section within the OP.

Spoiler:

Carnifexes
Background
When one thinks of a Tyranid army, one of the first models to come to mind is the Carnifex. One of the most iconic Tyranid models to be in existance, especially in 4th edition where Carnifexes could also be taken in Elites. As fifth edition came out, they became redundant with the arrival of the new Trygon and lack of option to be taken as an Elite and slowly started to gather dust. Following the arrival of 6th edition, Carnifexes were hailed as one of the shining stars of the Codex, getting a notable points decrease as well as being able to take multiples in a brood, opening up Heavy Support options. As 7th edition rolled out they came to be the only Monstrous Creature in the Tyranid Codex that wasn't nerfed by the changes to Smash, making use of it's standard base 9 Strength to deal with anything that comes across its path.

Competitive Setting
A Carnifex Brood uses one of the Heavy Support slots in a Tyranid army. It follows a standard TMC statline, with WS3, BS3, T6 with a 3+ Armour Save. As it does not have the Synapse Creature special rule, it will revert to Instinctive Behaviour outside of Synapse, of which the Carnifex rolls on the Feed table. Where the Carnifex starts to differ is that it only has 4 Wounds, making it not as durable as other TMC's and is Initiative 2, meaning that it strikes at the same speed as the lowly Ork and is out sped by anything that isn't a Power Fist or equivalent. However, where it lacks in speed, it makes up for in sheer brutality, sporting 3 attacks at base S9. Combined with it's Living Battering Ram special rule that grants it D3 Hammer of Wrath attacks instead of one, this makes it one of the premier options that Tyranids have for opening AV13/14.

Melee Weapons
Scything Talons - Carnifexes come equipped with two pairs of Scything Talons. Although being nerfed, they do allow for customization of a Carnifex by exchanging a pair for Wargear upgrades.
For those that want to keep Carnifexes cheap, this is a good option.
Crushing Claws - Crushing Claws grants a Carnifex S10 in Close Combat (note, not for Hammer of Wrath), allowing it to Instant Kill T5 as well as giving it the Armourbane USR, making it more likely to Penetrate AV13-14.
For Carnifexes designed for vehicle hunting, this is a good option.

Monstrous Bio-Cannons
Twin-Linked Deathspitter - A Carnifex may replace one pair of Scything Talons with a TL Deathspitter, granting it three 18" TL shots at S5 AP5. This is not very good, especially when taken in context, it is outclassed by another Monstrous Biocannon.
This is a bad option.
Twin-Linked Devourer with Brainleech worms - A Carnifex may replace one pair of Scything Talons with a TL Devourer with Brainleech Worms, granting it six 18" TL shots at S6 AP-. This allows a Carnifex to be multi-purpose, wounding Infantry through number of shots, as well as Light Armour and in emergencies, ground based AA.
This is a good option.
Stranglethorn Cannon - A Carnifex may replace one pair of Scything Talons with a Stranglethorn Cannon, granting it one 36" shot at S6 AP5 Large Blast, Pinning Shot. The Stranglethorn Cannon may only be taken once per model and may not be taken with the Heavy Venom Cannon. This allows a Carnifex to act as a Infantry killer and support smaller Tyranids by potentially making it harder to shoot at them. However, with a Carnifexes bad Ballistic Skill, it might scatter off the target and is in general, outclassed by Biovores, who give three Large Blast Templates at a large ranger for the price of a standard Carnifex.
This is a bad option.
Heavy Venom Cannon - A Carnifex may replace one pair of Scything Talons with a Heavy Venom Cannon, granting it one 36" shot at S9 AP4 Blast. Only one Heavy Venom Cannon may be taken per model and may not be taken with the Stranglethorn Cannon. This allows a Carnifex to fire a single S9 shot before it charges a vehicle, making it easier to wreck vehicles, as well as Instant Killing T4. For Carnifexes designed for Vehicles-hunting, this could be the last glancing hit you need to wreck that vehicle.
This is a decent option.

Biomorphs
Toxin Sacs A Carnifex with Toxin Sacs has the Poisoned USR. This, combined with the natural S9 of the Carnifex, will normally allow it to re-roll failed to Wound rolls. However, the Carnifex only has 3 attacks base and WS3, meaning you might not get to make use of the re-roll to wounds.
This is a decent option.
Acid Blood A Carnifex with Acid Blood the ability to inflict a S5 AP2 hit per unsaved wound in Close Combat. This looks quite good, until you realise the Carnifex only has four Wounds, as well as the opponent having to take an Initiative before the hit can apply.
This is a bad option.
Adrenal Glands. A Carnifex with Adrenal Glands has the Fleet and Furious Charge USR. This allows a Carnifex to have S10 on the charge (note, not for Hammer of Wrath), as well as re-roll Run and Charge distances. This makes getting into combat much easier and combined with the Onslaught Psychic Power, allows Carnifexes to get into position quickly to start firing any Ranged Weapons they have.
This is a good option.
Regeneration. A Carnifex with Regeneration has the ability to regain lost wounds at the end of the game turn on a 4+. This looks promising, until one realizes it is the least durable Monstrous Creature that Tyranids have, on virtue of it having the fewest amount of Wounds (aside the Hive Tyrant, which can mitigate this with the Catalyst Psychic Power and Wings for a FMC profile) and only has a 3+ armour save coupled with it's Toughness characteristic of 6, meaning it can be focused fired down before it can make use of Regeneration.
This is a bad option.

Tail Biomorphs
Thresher Scythe - A Carnifex with a Thresher Scythe may make an additional S4 AP4 attack with the Rending special rule in close combat. Considering that the Carnifex that is in combat is usually geared for vehicle killing, this is not likely to help.
This is a bad option.
Bone Mace - A Carnifex with a Bone Mace may make an additional S8 AP - attack in close combat. They cost the same as Crushing Claws which will more reliably open vehicles, but if you feel that you are not destroying vehicles enough, it grants additional attack that may cause that final glancing hit.
This is a decent option.

Options
Additional Carnifexes - a Carnifex Brood may take up to two more Carnifexes. This allows a Tyranid player to shift Carnifexes around for Wound allocation purposes making the brood more durable, as well as have more Carnifexes without using up the Heavy Support slots. Any Carnifex brood consisting of two or three Carnifexes can not make use of the Tyrannocyte, making this option a speed vs durability argument.It is important to note however, that any Carnifex Brood with two or three models, are vulnerable to the harshest Instinctive Behaviour: Feed table.
For lists that do not use Tyrannocytes, or do not want Carnifexes using a Tyrannocyte, this is a good option.
For lists that do make use of Tyrannocytes, this is decent option.
Spine Banks - A Carnifex with Spine Banks may fire one 8" shot at S3 AP- Blast and is treated as having Assault Grenades. This is generally not worth it as the damage output is so low and Carnifexes have a low Initiative to begin with.
This is a bad option.
Bio-Plasma - A Carnifex with Bio=Plasma may fire one 12" shot at S7 AP2 Blast. This is better than Spine Banks as you can wound a lot more stuff. It is still a bit pricey however and for thirty points more, one can purchase an Exocrine, which has a larger blast or six shots at double the range and when stationary, a better BS.
This is a decent option.

Transport
Tyrannocyte As soon as the Tyrannocyte was announced, there was much rejoicing amongst Tyranid players. Tyrannocytes give much needed speed to Tyranids, which allows Carnifexes to move up even faster than before. Note that only one MC model can embark the Tyrannocyte upon deployment. Tyrannocytes work best when a model can immedietly do something upon deployment, such as shoot or provide Synapse so is not the best option for all Carnifexes.
For single Carnifexes with Ranged Weapons, this is a good option.
For single Carnifexes with Melee only weapons, this is a decent option.
For Carnifexes with long range weapons (HVC or SC) or broods of two or more models, this is a bad option.

Standard Competitive Builds
Carnifex w/ 2x TL Devourers with Brainleech Worms - can be taken alone to fit in a Tyrannocyte or in multiples for more firepower, this type of Carnifex, known as the 'Dakkafex' spits out a large number of shots which shave wounds off units. Adrenal Glands are an optional extra to allow it to more reliable deal with vehicles or move into position.
Carnifex w/ Scything Talons, Crushing Claws - This type of Carnifex commonly has two more standard Carnifexes for ablative wounds, as they move up the battlefield looking for the highest AV vehicles and destroying them with ease. Adrenal Glands are not a necessity as the Crushing Claws variant can reliably deal with high AV vehicles and you normally have ablative wounds for your Crushing Claws Carnifex.
Carnifex w/ 2x Scything Talons, Adrenal Glands - The 'Screamer-Killer' is a basic Carnifex. It can either be taken in multiples for more Wounds to chew through, or as a single unit

Stone Crusher Carnifexes
From Forge World, Stone Crusher Carnifexes are even stronger than regular Carnifexes, boasting S10 on their base statline. This becomes even better when you consider the fact they also have Living Battery Ram, as well as their own special rules, Wrecker, Sunder and Carapace Chitin-rams. This gives all Hammer of Wrath attacks Armourbane and Monster Hunter, meaning they can put wounds on MC and vehicles alike. Wrecker and Sunder is what really sets them apart from Carnifexes, they are allowed to re-roll all failed Armour Penetration rolls, as well as add one to the result if against immobile structures and fortifications (on top of the +2 granted by the Wrecker Claws AP1 value) when using their Wrecker Claws. Although the Stone Wrecker Carnifex has less attacks than the Carnifex (two compared to three) any attack that goes through is more than likely going to cause an Explodes! result. As a trade off for their close combat power, they have no access to Monstrous Biocannons.

While having an identical profile to the Carnifex (Trading an attack for Strength 10 aside), they are more durable then Carnifexes, due to their Reinforced Caraspace special rule, which makes any shooting attacks resolved against a Stone Crusher Carnifex reduce their Strength by one. Essentially, this means the Stone Crusher Carnifex is T7 against shooting attacks (note this does not apply to close combat attacks).

Stone Crusher Carnifexes upgrades
Additional Stone Crusher Carnifexes - like regular Carnifexes, additional Carnifexes may be taken for Wound allocation purposes. Considering that they are Toughness 7 against shooting attacks, this will prolong the life of Stone Crusher Carnifexes considerably. As mentioned in the Tyrannocyte entry for Carnifexes, models that can do something upon Deep Strike arrival are good. Stone Crusher Carnifexes have the durability to run up the field and bear the brunt of most weapons, especially with Shrouded support. Note that broads of two or more Stone Crusher Carnifexes are vulnerable to the worst result on the Instinctive Behaviour: Feed table.
For lists that do make use of Tyrannocytes, this is decent option.
For lists that do not use Tyrannocytes, or do not want Stone Wrecker Carnifexes using a Tyrannocyte, this is a good option.
Spine Banks - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bio-Plasma -Generally not worth it since a Stone Wrecker Carnifex does not want to be targetting Infantry.
This is a bad option.
Thresher Scythe - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bone Mace - Unlike regular Carnifexes, Stone Wrecker Carnifexes do not require help destroying vehicles.
This is a bad option.
Wrecker Claw and Bio-Flail - A Stone Wrecker Carnifex with a Wrecker Claw and Bio-Flail replaces their ability to re-roll amour penetration on their regular attacks with the ability to cause Instant Death and gain a new rule, Sweep Attack. Sweep Attack allows a model to replace all their attacks with a number of attacks equal to the number of enemy models in base contact with them. This allows a Stone Crusher Carnifex with a Wrecker Claw and Bio-Flail to generate more attacks and stops it being tarpitted as easily, while the trade off is that they may find it harder to destroy vehicles.
For Stone Crusher Carnifex broods consisting of two or three models, this is a good option.
For Stone Crusher Carnifex broods consisting of one model, this is a decent option.


Transport
Much like a regular Carnifex, a single Stone Crusher Carnifex can embark on a Tyrannocyte. However, a Stone Wrecker Carnifex has more durability than a regular Carnifex and can forgo a Transport in favour of running up. Note however, that a Stone Wrecker Carnifex can not usse Adrenal Glands at all, so it is still quite slow in that regard, meaning the Tyrannocyte can provide the speed that a Stone Wrecker Carnifex needs in order to do damage.
For single Stone Wrecker Carnifexes, this is a good option.
For Stone Wrecker Carnifex broods of two or more models, this is a bad option.

Standard Competitive Builds
Stone Wrecker Carnifex w/ Wrecker Claws - A standard Stone Wrecker Carnifex does a fine job of destroying vehicles without any upgrades.
Stone Wrecker Carnifex w/ Wrecker Claw and Bio-flail - A Stone Wrecker Carnifex with Wrecker Claw and Bio-flail should only be taken in groups of two or more, as it prevents a heavily points invested unit being tarpitted easily.

Conclusion and Overall Rating

Carnifex Overall rating = A-
The Carnifex can provide a lot for a Tyranid army that is not covered well within the rest of the army, such as high volumes of fire or dealing with AV13-14 and as such, are recommended in most builds of Tyranids. The Carnifex can be kitted out for different roles, making it a multi-purpose unit, which is useful in the case that you may not always be playing against vehicles. The Carnifex just falls short of being an all-star by a reliance on Synapse to function well, as well as requiring support from other Tyranids to provide it with a cover save, or to simply draw fire away from it as it is fragile in comparison to other TMCs.

Stone Crusher Carnifex Overall Rating = B
While the Stone Crusher Carnifex is the best answer Tyranids have to heavy vehicle duties, it's role is very linear and does not allow much adaptability. It also suffers from requiring Synapse to be effective and even with pseudo Toughness 7, is still quite vulnerable to volume of fire with only four wounds.

rigeld2 wrote:
40 dice (if you Rage, which is unlikely).
20 hits.
10 wounds.
3 failed saves.

And then next turn it's 20 dice, 10 hits, 5 wounds, 1 failed save.

The Tac squad (ignoring the sarge being different) will swing 7 times, wound 4 times, and you'll fail 3-4 saves. So on the charge with Rage (best case scenario) you'll tie or lose combat.

Yeah, that's good.

pinecone77 wrote:

 Frozocrone wrote:
I have done one for Carnifexes. I followed a Green, Amber, Red system for weapons and biomorphs to say which ones would be most viable in a competitive setting. Proof reading/critique by others would be appreciated. I am happy to edit this post if people have suggestions or builds (or to completely re-write it )

I've not included Formations with Carnifexes in, I think they could have their own section within the OP.

Spoiler:

Carnifexes
Background
When one thinks of a Tyranid army, one of the first models to come to mind is the Carnifex. One of the most iconic Tyranid models to be in existance, especially in 4th edition where Carnifexes could also be taken in Elites. As fifth edition came out, they became redundant with the arrival of the new Trygon and lack of option to be taken as an Elite and slowly started to gather dust. Following the arrival of 6th edition, Carnifexes were hailed as one of the shining stars of the Codex, getting a notable points decrease as well as being able to take multiples in a brood, opening up Heavy Support options. As 7th edition rolled out they came to be the only Monstrous Creature in the Tyranid Codex that wasn't nerfed by the changes to Smash, making use of it's standard base 9 Strength to deal with anything that comes across its path.

Competitive Setting
A Carnifex Brood uses one of the Heavy Support slots in a Tyranid army. It follows a standard TMC statline, with WS3, BS3, T6 with a 3+ Armour Save. As it does not have the Synapse Creature special rule, it will revert to Instinctive Behaviour outside of Synapse, of which the Carnifex rolls on the Feed table. Where the Carnifex starts to differ is that it only has 4 Wounds, making it not as durable as other TMC's and is Initiative 2, meaning that it strikes at the same speed as the lowly Ork and is out sped by anything that isn't a Power Fist or equivalent. However, where it lacks in speed, it makes up for in sheer brutality, sporting 3 attacks at base S9. Combined with it's Living Battering Ram special rule that grants it D3 Hammer of Wrath attacks instead of one, this makes it one of the premier options that Tyranids have for opening AV13/14.

Melee Weapons
Scything Talons - Carnifexes come equipped with two pairs of Scything Talons. Although being nerfed, they do allow for customization of a Carnifex by exchanging a pair for Wargear upgrades.
For those that want to keep Carnifexes cheap, this is a good option.
Crushing Claws - Crushing Claws grants a Carnifex S10 in Close Combat (note, not for Hammer of Wrath), allowing it to Instant Kill T5 as well as giving it the Armourbane USR, making it more likely to Penetrate AV13-14.
For Carnifexes designed for vehicle hunting, this is a good option.

Monstrous Bio-Cannons
Twin-Linked Deathspitter - A Carnifex may replace one pair of Scything Talons with a TL Deathspitter, granting it three 18" TL shots at S5 AP5. This is not very good, especially when taken in context, it is outclassed by another Monstrous Biocannon.
This is a bad option.
Twin-Linked Devourer with Brainleech worms - A Carnifex may replace one pair of Scything Talons with a TL Devourer with Brainleech Worms, granting it six 18" TL shots at S6 AP-. This allows a Carnifex to be multi-purpose, wounding Infantry through number of shots, as well as Light Armour and in emergencies, ground based AA.
This is a good option.
Stranglethorn Cannon - A Carnifex may replace one pair of Scything Talons with a Stranglethorn Cannon, granting it one 36" shot at S6 AP5 Large Blast, Pinning Shot. The Stranglethorn Cannon may only be taken once per model and may not be taken with the Heavy Venom Cannon. This allows a Carnifex to act as a Infantry killer and support smaller Tyranids by potentially making it harder to shoot at them. However, with a Carnifexes bad Ballistic Skill, it might scatter off the target and is in general, outclassed by Biovores, who give three Large Blast Templates at a large ranger for the price of a standard Carnifex.
This is a bad option.
Heavy Venom Cannon - A Carnifex may replace one pair of Scything Talons with a Heavy Venom Cannon, granting it one 36" shot at S9 AP4 Blast. Only one Heavy Venom Cannon may be taken per model and may not be taken with the Stranglethorn Cannon. This allows a Carnifex to fire a single S9 shot before it charges a vehicle, making it easier to wreck vehicles, as well as Instant Killing T4. For Carnifexes designed for Vehicles-hunting, this could be the last glancing hit you need to wreck that vehicle.
This is a decent option.

Biomorphs
Toxin Sacs A Carnifex with Toxin Sacs has the Poisoned USR. This, combined with the natural S9 of the Carnifex, will normally allow it to re-roll failed to Wound rolls. However, the Carnifex only has 3 attacks base and WS3, meaning you might not get to make use of the re-roll to wounds.
This is a decent option.
Acid Blood A Carnifex with Acid Blood the ability to inflict a S5 AP2 hit per unsaved wound in Close Combat. This looks quite good, until you realise the Carnifex only has four Wounds, as well as the opponent having to take an Initiative before the hit can apply.
This is a bad option.
Adrenal Glands. A Carnifex with Adrenal Glands has the Fleet and Furious Charge USR. This allows a Carnifex to have S10 on the charge (note, not for Hammer of Wrath), as well as re-roll Run and Charge distances. This makes getting into combat much easier and combined with the Onslaught Psychic Power, allows Carnifexes to get into position quickly to start firing any Ranged Weapons they have.
This is a good option.
Regeneration. A Carnifex with Regeneration has the ability to regain lost wounds at the end of the game turn on a 4+. This looks promising, until one realizes it is the least durable Monstrous Creature that Tyranids have, on virtue of it having the fewest amount of Wounds (aside the Hive Tyrant, which can mitigate this with the Catalyst Psychic Power and Wings for a FMC profile) and only has a 3+ armour save coupled with it's Toughness characteristic of 6, meaning it can be focused fired down before it can make use of Regeneration.
This is a bad option.

Tail Biomorphs
Thresher Scythe - A Carnifex with a Thresher Scythe may make an additional S4 AP4 attack with the Rending special rule in close combat. Considering that the Carnifex that is in combat is usually geared for vehicle killing, this is not likely to help.
This is a bad option.
Bone Mace - A Carnifex with a Bone Mace may make an additional S8 AP - attack in close combat. They cost the same as Crushing Claws which will more reliably open vehicles, but if you feel that you are not destroying vehicles enough, it grants additional attack that may cause that final glancing hit.
This is a decent option.

Options
Additional Carnifexes - a Carnifex Brood may take up to two more Carnifexes. This allows a Tyranid player to shift Carnifexes around for Wound allocation purposes making the brood more durable, as well as have more Carnifexes without using up the Heavy Support slots. Any Carnifex brood consisting of two or three Carnifexes can not make use of the Tyrannocyte, making this option a speed vs durability argument.It is important to note however, that any Carnifex Brood with two or three models, are vulnerable to the harshest Instinctive Behaviour: Feed table.
For lists that do not use Tyrannocytes, or do not want Carnifexes using a Tyrannocyte, this is a good option.
For lists that do make use of Tyrannocytes, this is decent option.
Spine Banks - A Carnifex with Spine Banks may fire one 8" shot at S3 AP- Blast and is treated as having Assault Grenades. This is generally not worth it as the damage output is so low and Carnifexes have a low Initiative to begin with.
This is a bad option.
Bio-Plasma - A Carnifex with Bio=Plasma may fire one 12" shot at S7 AP2 Blast. This is better than Spine Banks as you can wound a lot more stuff. It is still a bit pricey however and for thirty points more, one can purchase an Exocrine, which has a larger blast or six shots at double the range and when stationary, a better BS.
This is a decent option.

Transport
Tyrannocyte As soon as the Tyrannocyte was announced, there was much rejoicing amongst Tyranid players. Tyrannocytes give much needed speed to Tyranids, which allows Carnifexes to move up even faster than before. Note that only one MC model can embark the Tyrannocyte upon deployment. Tyrannocytes work best when a model can immedietly do something upon deployment, such as shoot or provide Synapse so is not the best option for all Carnifexes.
For single Carnifexes with Ranged Weapons, this is a good option.
For single Carnifexes with Melee only weapons, this is a decent option.
For Carnifexes with long range weapons (HVC or SC) or broods of two or more models, this is a bad option.

Standard Competitive Builds
Carnifex w/ 2x TL Devourers with Brainleech Worms - can be taken alone to fit in a Tyrannocyte or in multiples for more firepower, this type of Carnifex, known as the 'Dakkafex' spits out a large number of shots which shave wounds off units. Adrenal Glands are an optional extra to allow it to more reliable deal with vehicles or move into position.
Carnifex w/ Scything Talons, Crushing Claws - This type of Carnifex commonly has two more standard Carnifexes for ablative wounds, as they move up the battlefield looking for the highest AV vehicles and destroying them with ease. Adrenal Glands are not a necessity as the Crushing Claws variant can reliably deal with high AV vehicles and you normally have ablative wounds for your Crushing Claws Carnifex.
Carnifex w/ 2x Scything Talons, Adrenal Glands - The 'Screamer-Killer' is a basic Carnifex. It can either be taken in multiples for more Wounds to chew through, or as a single unit

Stone Crusher Carnifexes
From Forge World, Stone Crusher Carnifexes are even stronger than regular Carnifexes, boasting S10 on their base statline. This becomes even better when you consider the fact they also have Living Battery Ram, as well as their own special rules, Wrecker, Sunder and Carapace Chitin-rams. This gives all Hammer of Wrath attacks Armourbane and Monster Hunter, meaning they can put wounds on MC and vehicles alike. Wrecker and Sunder is what really sets them apart from Carnifexes, they are allowed to re-roll all failed Armour Penetration rolls, as well as add one to the result if against immobile structures and fortifications (on top of the +2 granted by the Wrecker Claws AP1 value) when using their Wrecker Claws. Although the Stone Wrecker Carnifex has less attacks than the Carnifex (two compared to three) any attack that goes through is more than likely going to cause an Explodes! result. As a trade off for their close combat power, they have no access to Monstrous Biocannons.

While having an identical profile to the Carnifex (Trading an attack for Strength 10 aside), they are more durable then Carnifexes, due to their Reinforced Caraspace special rule, which makes any shooting attacks resolved against a Stone Crusher Carnifex reduce their Strength by one. Essentially, this means the Stone Crusher Carnifex is T7 against shooting attacks (note this does not apply to close combat attacks).

Stone Crusher Carnifexes upgrades
Additional Stone Crusher Carnifexes - like regular Carnifexes, additional Carnifexes may be taken for Wound allocation purposes. Considering that they are Toughness 7 against shooting attacks, this will prolong the life of Stone Crusher Carnifexes considerably. As mentioned in the Tyrannocyte entry for Carnifexes, models that can do something upon Deep Strike arrival are good. Stone Crusher Carnifexes have the durability to run up the field and bear the brunt of most weapons, especially with Shrouded support. Note that broads of two or more Stone Crusher Carnifexes are vulnerable to the worst result on the Instinctive Behaviour: Feed table.
For lists that do make use of Tyrannocytes, this is decent option.
For lists that do not use Tyrannocytes, or do not want Stone Wrecker Carnifexes using a Tyrannocyte, this is a good option.
Spine Banks - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bio-Plasma -Generally not worth it since a Stone Wrecker Carnifex does not want to be targetting Infantry.
This is a bad option.
Thresher Scythe - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bone Mace - Unlike regular Carnifexes, Stone Wrecker Carnifexes do not require help destroying vehicles.
This is a bad option.
Wrecker Claw and Bio-Flail - A Stone Wrecker Carnifex with a Wrecker Claw and Bio-Flail replaces their ability to re-roll amour penetration on their regular attacks with the ability to cause Instant Death and gain a new rule, Sweep Attack. Sweep Attack allows a model to replace all their attacks with a number of attacks equal to the number of enemy models in base contact with them. This allows a Stone Crusher Carnifex with a Wrecker Claw and Bio-Flail to generate more attacks and stops it being tarpitted as easily, while the trade off is that they may find it harder to destroy vehicles.
For Stone Crusher Carnifex broods consisting of two or three models, this is a good option.
For Stone Crusher Carnifex broods consisting of one model, this is a decent option.


Transport
Much like a regular Carnifex, a single Stone Crusher Carnifex can embark on a Tyrannocyte. However, a Stone Wrecker Carnifex has more durability than a regular Carnifex and can forgo a Transport in favour of running up. Note however, that a Stone Wrecker Carnifex can not usse Adrenal Glands at all, so it is still quite slow in that regard, meaning the Tyrannocyte can provide the speed that a Stone Wrecker Carnifex needs in order to do damage.
For single Stone Wrecker Carnifexes, this is a good option.
For Stone Wrecker Carnifex broods of two or more models, this is a bad option.

Standard Competitive Builds
Stone Wrecker Carnifex w/ Wrecker Claws - A standard Stone Wrecker Carnifex does a fine job of destroying vehicles without any upgrades.
Stone Wrecker Carnifex w/ Wrecker Claw and Bio-flail - A Stone Wrecker Carnifex with Wrecker Claw and Bio-flail should only be taken in groups of two or more, as it prevents a heavily points invested unit being tarpitted easily.

Conclusion and Overall Rating

Carnifex Overall rating = A-
The Carnifex can provide a lot for a Tyranid army that is not covered well within the rest of the army, such as high volumes of fire or dealing with AV13-14 and as such, are recommended in most builds of Tyranids. The Carnifex can be kitted out for different roles, making it a multi-purpose unit, which is useful in the case that you may not always be playing against vehicles. The Carnifex just falls short of being an all-star by a reliance on Synapse to function well, as well as requiring support from other Tyranids to provide it with a cover save, or to simply draw fire away from it as it is fragile in comparison to other TMCs.

Stone Crusher Carnifex Overall Rating = B
While the Stone Crusher Carnifex is the best answer Tyranids have to heavy vehicle duties, it's role is very linear and does not allow much adaptability. It also suffers from requiring Synapse to be effective and even with pseudo Toughness 7, is still quite vulnerable to volume of fire with only four wounds.

Nice! A few minor nit-picks.. One there are some small spelling errors, so you might want to give it a look sometime for that. Two, in my heart a Screamer-Killer is always a Vanilla Carnifex, with Bio-plasma And it is the Adrenals that are optional. I'd suggest listing the Vanilla fex as a separate entry, just so old dudes like me don't get all confused.. Lastly, while the current "meta" doesn't like Gunfexen (Heavy Cannon, TL Brain Leeches) that does not mean there are bad, so they likey deserve a mention, and I'd categorize Strangle Cannon as a "fair" to decent choice for a Carnifex/Gunfex, vs Marines it is not so good, but it eats up "horde" lists like candy! It's just that AM, and Orks are not very popular right now... I'd still consider using them if DE become a "thing" though.

 Sinful Hero wrote:

 Frozocrone wrote:
I have done one for Carnifexes. I followed a Green, Amber, Red system for weapons and biomorphs to say which ones would be most viable in a competitive setting. Proof reading/critique by others would be appreciated. I am happy to edit this post if people have suggestions or builds (or to completely re-write it )

I've not included Formations with Carnifexes in, I think they could have their own section within the OP.

Spoiler:

Carnifexes
Background
When one thinks of a Tyranid army, one of the first models to come to mind is the Carnifex. One of the most iconic Tyranid models to be in existance, especially in 4th edition where Carnifexes could also be taken in Elites. As fifth edition came out, they became redundant with the arrival of the new Trygon and lack of option to be taken as an Elite and slowly started to gather dust. Following the arrival of 6th edition, Carnifexes were hailed as one of the shining stars of the Codex, getting a notable points decrease as well as being able to take multiples in a brood, opening up Heavy Support options. As 7th edition rolled out they came to be the only Monstrous Creature in the Tyranid Codex that wasn't nerfed by the changes to Smash, making use of it's standard base 9 Strength to deal with anything that comes across its path.

Competitive Setting
A Carnifex Brood uses one of the Heavy Support slots in a Tyranid army. It follows a standard TMC statline, with WS3, BS3, T6 with a 3+ Armour Save. As it does not have the Synapse Creature special rule, it will revert to Instinctive Behaviour outside of Synapse, of which the Carnifex rolls on the Feed table. Where the Carnifex starts to differ is that it only has 4 Wounds, making it not as durable as other TMC's and is Initiative 2, meaning that it strikes at the same speed as the lowly Ork and is out sped by anything that isn't a Power Fist or equivalent. However, where it lacks in speed, it makes up for in sheer brutality, sporting 3 attacks at base S9. Combined with it's Living Battering Ram special rule that grants it D3 Hammer of Wrath attacks instead of one, this makes it one of the premier options that Tyranids have for opening AV13/14.

Melee Weapons
Scything Talons - Carnifexes come equipped with two pairs of Scything Talons. Although being nerfed, they do allow for customization of a Carnifex by exchanging a pair for Wargear upgrades.
For those that want to keep Carnifexes cheap, this is a good option.
Crushing Claws - Crushing Claws grants a Carnifex S10 in Close Combat (note, not for Hammer of Wrath), allowing it to Instant Kill T5 as well as giving it the Armourbane USR, making it more likely to Penetrate AV13-14.
For Carnifexes designed for vehicle hunting, this is a good option.

Monstrous Bio-Cannons
Twin-Linked Deathspitter - A Carnifex may replace one pair of Scything Talons with a TL Deathspitter, granting it three 18" TL shots at S5 AP5. This is not very good, especially when taken in context, it is outclassed by another Monstrous Biocannon.
This is a bad option.
Twin-Linked Devourer with Brainleech worms - A Carnifex may replace one pair of Scything Talons with a TL Devourer with Brainleech Worms, granting it six 18" TL shots at S6 AP-. This allows a Carnifex to be multi-purpose, wounding Infantry through number of shots, as well as Light Armour and in emergencies, ground based AA.
This is a good option.
Stranglethorn Cannon - A Carnifex may replace one pair of Scything Talons with a Stranglethorn Cannon, granting it one 36" shot at S6 AP5 Large Blast, Pinning Shot. The Stranglethorn Cannon may only be taken once per model and may not be taken with the Heavy Venom Cannon. This allows a Carnifex to act as a Infantry killer and support smaller Tyranids by potentially making it harder to shoot at them. However, with a Carnifexes bad Ballistic Skill, it might scatter off the target and is in general, outclassed by Biovores, who give three Large Blast Templates at a large ranger for the price of a standard Carnifex.
This is a bad option.
Heavy Venom Cannon - A Carnifex may replace one pair of Scything Talons with a Heavy Venom Cannon, granting it one 36" shot at S9 AP4 Blast. Only one Heavy Venom Cannon may be taken per model and may not be taken with the Stranglethorn Cannon. This allows a Carnifex to fire a single S9 shot before it charges a vehicle, making it easier to wreck vehicles, as well as Instant Killing T4. For Carnifexes designed for Vehicles-hunting, this could be the last glancing hit you need to wreck that vehicle.
This is a decent option.

Biomorphs
Toxin Sacs A Carnifex with Toxin Sacs has the Poisoned USR. This, combined with the natural S9 of the Carnifex, will normally allow it to re-roll failed to Wound rolls. However, the Carnifex only has 3 attacks base and WS3, meaning you might not get to make use of the re-roll to wounds.
This is a decent option.
Acid Blood A Carnifex with Acid Blood the ability to inflict a S5 AP2 hit per unsaved wound in Close Combat. This looks quite good, until you realise the Carnifex only has four Wounds, as well as the opponent having to take an Initiative before the hit can apply.
This is a bad option.
Adrenal Glands. A Carnifex with Adrenal Glands has the Fleet and Furious Charge USR. This allows a Carnifex to have S10 on the charge (note, not for Hammer of Wrath), as well as re-roll Run and Charge distances. This makes getting into combat much easier and combined with the Onslaught Psychic Power, allows Carnifexes to get into position quickly to start firing any Ranged Weapons they have.
This is a good option.
Regeneration. A Carnifex with Regeneration has the ability to regain lost wounds at the end of the game turn on a 4+. This looks promising, until one realizes it is the least durable Monstrous Creature that Tyranids have, on virtue of it having the fewest amount of Wounds (aside the Hive Tyrant, which can mitigate this with the Catalyst Psychic Power and Wings for a FMC profile) and only has a 3+ armour save coupled with it's Toughness characteristic of 6, meaning it can be focused fired down before it can make use of Regeneration.
This is a bad option.

Tail Biomorphs
Thresher Scythe - A Carnifex with a Thresher Scythe may make an additional S4 AP4 attack with the Rending special rule in close combat. Considering that the Carnifex that is in combat is usually geared for vehicle killing, this is not likely to help.
This is a bad option.
Bone Mace - A Carnifex with a Bone Mace may make an additional S8 AP - attack in close combat. They cost the same as Crushing Claws which will more reliably open vehicles, but if you feel that you are not destroying vehicles enough, it grants additional attack that may cause that final glancing hit.
This is a decent option.

Options
Additional Carnifexes - a Carnifex Brood may take up to two more Carnifexes. This allows a Tyranid player to shift Carnifexes around for Wound allocation purposes making the brood more durable, as well as have more Carnifexes without using up the Heavy Support slots. Any Carnifex brood consisting of two or three Carnifexes can not make use of the Tyrannocyte, making this option a speed vs durability argument.It is important to note however, that any Carnifex Brood with two or three models, are vulnerable to the harshest Instinctive Behaviour: Feed table.
For lists that do not use Tyrannocytes, or do not want Carnifexes using a Tyrannocyte, this is a good option.
For lists that do make use of Tyrannocytes, this is decent option.
Spine Banks - A Carnifex with Spine Banks may fire one 8" shot at S3 AP- Blast and is treated as having Assault Grenades. This is generally not worth it as the damage output is so low and Carnifexes have a low Initiative to begin with.
This is a bad option.
Bio-Plasma - A Carnifex with Bio=Plasma may fire one 12" shot at S7 AP2 Blast. This is better than Spine Banks as you can wound a lot more stuff. It is still a bit pricey however and for thirty points more, one can purchase an Exocrine, which has a larger blast or six shots at double the range and when stationary, a better BS.
This is a decent option.

Transport
Tyrannocyte As soon as the Tyrannocyte was announced, there was much rejoicing amongst Tyranid players. Tyrannocytes give much needed speed to Tyranids, which allows Carnifexes to move up even faster than before. Note that only one MC model can embark the Tyrannocyte upon deployment. Tyrannocytes work best when a model can immedietly do something upon deployment, such as shoot or provide Synapse so is not the best option for all Carnifexes.
For single Carnifexes with Ranged Weapons, this is a good option.
For single Carnifexes with Melee only weapons, this is a decent option.
For Carnifexes with long range weapons (HVC or SC) or broods of two or more models, this is a bad option.

Standard Competitive Builds
Carnifex w/ 2x TL Devourers with Brainleech Worms - can be taken alone to fit in a Tyrannocyte or in multiples for more firepower, this type of Carnifex, known as the 'Dakkafex' spits out a large number of shots which shave wounds off units. Adrenal Glands are an optional extra to allow it to more reliable deal with vehicles or move into position.
Carnifex w/ Scything Talons, Crushing Claws - This type of Carnifex commonly has two more standard Carnifexes for ablative wounds, as they move up the battlefield looking for the highest AV vehicles and destroying them with ease. Adrenal Glands are not a necessity as the Crushing Claws variant can reliably deal with high AV vehicles and you normally have ablative wounds for your Crushing Claws Carnifex.
Carnifex w/ 2x Scything Talons, Adrenal Glands - The 'Screamer-Killer' is a basic Carnifex. It can either be taken in multiples for more Wounds to chew through, or as a single unit

Stone Crusher Carnifexes
From Forge World, Stone Crusher Carnifexes are even stronger than regular Carnifexes, boasting S10 on their base statline. This becomes even better when you consider the fact they also have Living Battery Ram, as well as their own special rules, Wrecker, Sunder and Carapace Chitin-rams. This gives all Hammer of Wrath attacks Armourbane and Monster Hunter, meaning they can put wounds on MC and vehicles alike. Wrecker and Sunder is what really sets them apart from Carnifexes, they are allowed to re-roll all failed Armour Penetration rolls, as well as add one to the result if against immobile structures and fortifications (on top of the +2 granted by the Wrecker Claws AP1 value) when using their Wrecker Claws. Although the Stone Wrecker Carnifex has less attacks than the Carnifex (two compared to three) any attack that goes through is more than likely going to cause an Explodes! result. As a trade off for their close combat power, they have no access to Monstrous Biocannons.

While having an identical profile to the Carnifex (Trading an attack for Strength 10 aside), they are more durable then Carnifexes, due to their Reinforced Caraspace special rule, which makes any shooting attacks resolved against a Stone Crusher Carnifex reduce their Strength by one. Essentially, this means the Stone Crusher Carnifex is T7 against shooting attacks (note this does not apply to close combat attacks).

Stone Crusher Carnifexes upgrades
Additional Stone Crusher Carnifexes - like regular Carnifexes, additional Carnifexes may be taken for Wound allocation purposes. Considering that they are Toughness 7 against shooting attacks, this will prolong the life of Stone Crusher Carnifexes considerably. As mentioned in the Tyrannocyte entry for Carnifexes, models that can do something upon Deep Strike arrival are good. Stone Crusher Carnifexes have the durability to run up the field and bear the brunt of most weapons, especially with Shrouded support. Note that broads of two or more Stone Crusher Carnifexes are vulnerable to the worst result on the Instinctive Behaviour: Feed table.
For lists that do make use of Tyrannocytes, this is decent option.
For lists that do not use Tyrannocytes, or do not want Stone Wrecker Carnifexes using a Tyrannocyte, this is a good option.
Spine Banks - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bio-Plasma -Generally not worth it since a Stone Wrecker Carnifex does not want to be targetting Infantry.
This is a bad option.
Thresher Scythe - Like regular Carnifexes, this does not help them destroy vehicles.
This is a bad option.
Bone Mace - Unlike regular Carnifexes, Stone Wrecker Carnifexes do not require help destroying vehicles.
This is a bad option.
Wrecker Claw and Bio-Flail - A Stone Wrecker Carnifex with a Wrecker Claw and Bio-Flail replaces their ability to re-roll amour penetration on their regular attacks with the ability to cause Instant Death and gain a new rule, Sweep Attack. Sweep Attack allows a model to replace all their attacks with a number of attacks equal to the number of enemy models in base contact with them. This allows a Stone Crusher Carnifex with a Wrecker Claw and Bio-Flail to generate more attacks and stops it being tarpitted as easily, while the trade off is that they may find it harder to destroy vehicles.
For Stone Crusher Carnifex broods consisting of two or three models, this is a good option.
For Stone Crusher Carnifex broods consisting of one model, this is a decent option.


Transport
Much like a regular Carnifex, a single Stone Crusher Carnifex can embark on a Tyrannocyte. However, a Stone Wrecker Carnifex has more durability than a regular Carnifex and can forgo a Transport in favour of running up. Note however, that a Stone Wrecker Carnifex can not usse Adrenal Glands at all, so it is still quite slow in that regard, meaning the Tyrannocyte can provide the speed that a Stone Wrecker Carnifex needs in order to do damage.
For single Stone Wrecker Carnifexes, this is a good option.
For Stone Wrecker Carnifex broods of two or more models, this is a bad option.

Standard Competitive Builds
Stone Wrecker Carnifex w/ Wrecker Claws - A standard Stone Wrecker Carnifex does a fine job of destroying vehicles without any upgrades.
Stone Wrecker Carnifex w/ Wrecker Claw and Bio-flail - A Stone Wrecker Carnifex with Wrecker Claw and Bio-flail should only be taken in groups of two or more, as it prevents a heavily points invested unit being tarpitted easily.

Conclusion and Overall Rating

Carnifex Overall rating = A-
The Carnifex can provide a lot for a Tyranid army that is not covered well within the rest of the army, such as high volumes of fire or dealing with AV13-14 and as such, are recommended in most builds of Tyranids. The Carnifex can be kitted out for different roles, making it a multi-purpose unit, which is useful in the case that you may not always be playing against vehicles. The Carnifex just falls short of being an all-star by a reliance on Synapse to function well, as well as requiring support from other Tyranids to provide it with a cover save, or to simply draw fire away from it as it is fragile in comparison to other TMCs.

Stone Crusher Carnifex Overall Rating = B
While the Stone Crusher Carnifex is the best answer Tyranids have to heavy vehicle duties, it's role is very linear and does not allow much adaptability. It also suffers from requiring Synapse to be effective and even with pseudo Toughness 7, is still quite vulnerable to volume of fire with only four wounds.

Awesome review- my only gripe is to change "broods of two or more cannot take a Tyrannocyte". Just nip that in the bud now.

Spoiler:

 jy2 wrote:

Let me know which you want to volunteer for and I will update this list. Or you could just post the review of the unit directly onto this thread and I will update the list and also the main tactica on p.1.