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He created the Warp-Storm known as "The Storm of the Emperor's Wrath", destroying an entire fleet of Vandire's during the Age of Apostasy. It's still there, four thousand years later.

He's the most powerful psyker to have ever lived. Gods fear Him.

The fact that He *is* single-handedly holding off the forces of Hell should give you some idea of the feats He is capable of performing.

And if the Void Dragon were to awaken... it's not so much the Dragon that is of concern to the Tyranid, it is the sudden opening of gods-know-how-many Dolmen Gates as the Necrons come to retrieve the shard of this god.

4. Nids got spanked by three SM companies. Imagine how they would fare against all of the defenses previously mentioned? No contest friend.

Really depends on the size of the Hive Fleet attacking though.

As someone else mentioned we'll never really know what true strenght or lack thereof the Nids have, due to GWs fluff writing and wanting to keep everything open and the "what might happen next?!" idea.
However it would be fair to assume if recent Nid incursions are but a probing Vanguard then I personally feel the Nids pose one hell of a threat to not just Terra and its defense but the Galaxy ta large.

Wasnt there a piece of fluff - not sure if cannonised that said the Nids have possibly consumed life in all nearby Galaxies and ours is the last stop as it were, with recent invasions just the frontline tendrils of a truely all encompassing monster?

The storm of the emperor's wrath is only consided the big E's doing (''The storm was considered the Emperor's will incarnate'' lexicantum) so we can no more say it was him then say eldradstill lives.

It is also said quite a lot more that there are a LOT more tyranids on the way then saying there arn't. 1 sentence says they are running, lots say that new fleets are emerging.

Where is your proof that the emperor can stop the shadow in thhe warp? We know the tyranids can blocks the Astronomican. We know the more tyranids the stronger the effect. So if its all the tyranids vs the Terra we can assume with out bias that they would block it out.

During the heresy the traitor legions got in-system with a fleet and didnt get blasted out the skies. We could assume the is because of traitors in there midsts slowing the proccess down and such, but we also have to take into account that the imperium was stonger back then. With better tech, or understanding of that tech. And if the big E was so powerful, why not just burst all them into flames? In him life the stongest power i have heard of him doing is blowing up a planet...big whoop. So if the traitor legions can get in-system why is it proposterous that they tyranids could with ultamately a LOT more ships, prohibiting psykic powers, and coursing natural destruction? I'd love to see mars put up a good defense while all its massive volcanoes are exploding simultaniously.

Where is your proof that the emperor can stop the shadow in thhe warp? We know the tyranids can blocks the Astronomican. We know the more tyranids the stronger the effect. So if its all the tyranids vs the Terra we can assume with out bias that they would block it out.

The Shadow is formed by the "static" created by the sum of the Tyranid bio-forms in a given region (which may be a huge area in space). The more Tyranid you have, the stronger the Shadow gets. The fewer, the weaker. Kill more Tyranid, the Shadow dissipates.

However... there is no list of the psychic powers the God-Emperor commands. What is known is that He is the most powerful human psyker to ever live. We have, from a variety of sources, other human psykers who do some pretty insane stuff. Crank those powers up to 11 and we might have an idea of how powerful the God-Emperor is.

And if the big E was so powerful, why not just burst all them into flames?

Because until the absolute very end, He believed that Horus could be saved.

The Tyranids also cannot cause volcanoes. They can cause tectonic upheaval with the narvhal, but that relies on the planet being the target destination. If Terra is the destination, not Mars, then the narvhal can't do anything to Mars. It's a mode of transport for the Tyranid, not a weapon. Trying to use it in-system, however, will crush the bugs within the gravitic fields of the local planets and the local star itself, and thus cannot be used at such close ranges.

 ALEXisAWESOME wrote:

Also, if that many tyrands converged on the terra from below the galactic plane as Leviathan did time to prepare before the shadow over came them would be minimal. The Astrominicion is the bait, imagin that the tyranids are one MASSIVE fish about to swallow it.

Considering that the galaxy is 3D and not that flat, I think they'd have plenty of time to figure it out. And if they do, then they can tear chunks out of it whilst it's still hibernating.

ALEXisAWESOME wrote:During the heresy the traitor legions got in-system with a fleet and didnt get blasted out the skies.

They lost, what, a third of their fleet against the Lunar defences alone? A lot of it was intact, and that was with half the forces of the Imperium at Horus' command, as well as the Mechanicus turning traitor. This is completely different. Not to mention I seem to recall (but alas, I've no idea where) reading that the defences have increased since the Horus Heresy. Also, we've no idea how destructive Narvhals actually are.

Ratius wrote:Wasnt there a piece of fluff - not sure if cannonised that said the Nids have possibly consumed life in all nearby Galaxies and ours is the last stop as it were, with recent invasions just the frontline tendrils of a truely all encompassing monster?

Something like they've left the barren husks of a dozen galaxies. On the other hand, how powerful and advanced the civilisations of those galaxies were is unknown, and the amount of biomass used up in traversing the void between galaxies would be immense.


I would say that judging by how the Battle for Macragge ended (a detonating Warp Drive), the Imperium could if all else fails (or even as a preliminary weapon) get ships to, well, fly into\near the Hive Fleet and detonate their Warp drives. The Imperium has no shortage of fanatics willing to give their lives, the Mechanicus could be convinced of the necessity of it, and it appears to be a horrendously powerful weapon. Really, why the Imperium doesn't do it more often is beyond me (yeah, I know, they tried a dumb way in a book, but with a little bit more intelligence it would work (i.e. having a timer or some fanatic). In fact, if it was so damaging to a Hive Fleet you could probably plunge planets into the Warp doing it.

The Tyranids also would of had to got through several hundred systems, meaning that the fleet that would have arrived would be massive in scale. We're talking Tyranid numbers in the sextillions, and having fought all that way, the Hive Mind would probably have a fairly tactical mindset, with newly evolved creatures and such.

But them we have the Imperium.

Terra and the Sol System is incredibly well armed, defended and ready to do so. Several Titan Legions, the Grey Knights home world, massive defensive fleets, the Imperial Fists, Custodians, Assassins, the Inquisition, and that's only to name those well known to be defending Terra. Black Templar's and other devout Space Marines would simply abandon their current activities and fight of the Tyranids.

Then we've got the Eldar.

If Big 'E is om'nomed, then Terra will become a daemon world of epic proportions. Daemons will spill out and the Imperium will break apart and splinter, meaning the forces of Chaos could spill out of the Eye, the Maelstrom and so on. The Eldar would almost certainly wish to stop such an event from occurring.

Then we've got the Necrons.

While not directly linked to defending Terra, the Tyranid's are taking away the only chance at returning to life, and the warp corrupting and destroying it will not help.

I recently read a book that, if ultimately accepted as canon through a new nid codex, will throw an interesting wrinkle in the Hive Fleets.

The Last Ditch by Sandy Mitchell

I feel like if the true full might of the Hive Fleets show up (since, it has been hinted at before that what has hit the galaxy is only the farthest tendrils), then it would really be the one thing that might just unite all the races together for a small time being.

I say this mostly out of the fact that the Tyranids are really the only thing that threatens every race equally. Look at it this way:

The humans would fight to no end to save Terra, we're talking basically every human being conscripted to fight and every Marine that they can get to hold Terra

The Eldar aren't stupid, arrogant but not stupid. They would realize that letting the Imperium be destroyed would basically screw over everyone, including themselves, as Chaos would be able to freely walk right on in.

The Tau take a similar reasoning as the Eldar, but maybe not fighting to prevent Chaos incursion.

The Orks love to fight, nuff said *shrug*

I'm honestly not sure about the Necrons, but I feel like they would fight a hive fleet if it got close

Chaos wouldn't likely get involved at first, but the Tyranids likely would nom Chaos souls just as fast as Loyal souls, and im also not quite sure about the relationship between the Hive Mind and Chaos besides the whole shadow in the warp thing.


Even if all the races aren't "allied" I feel like it would come down into a "The enemy of my enemy is my friend" kind of thing. I feel like most of the races could put away their total and utter hatred of each other for some time so they could beat back the Tyranids before going back to killing each other. Take the Damocles Crusade for instance. The Tau and IoM were going at it, then the Tyranid's came and they went separate ways to deal with that problem (as it was a much more pressing issue for both armies)

clively wrote:
I recently read a book that, if ultimately accepted as canon through a new nid codex, will throw an interesting wrinkle in the Hive Fleets.

The Last Ditch by Sandy Mitchell

Spoiler:

A mechanicus installation had some captured 'nids on ice that included parts of a bio ship.

The installation was faced with a hive fleet invasion from a different hive fleet. Interestingly, the hive fleet spent a considerable amount of resources attacking the installation in order to destroy the bio ship pieces and captured 'nids.

The book basically says that the hive fleets don't get along and will attack each other on site. It even goes on to say that the bio ships from different hive fleets can interfere with each other. Now, if multiple fleets are heading towards Terra then it stands to reason that more conflicts like this are going to happen.

If this is held as canon then the Imperium could be saved if they can distract those fleets into a civil war while picking off the outliers.

I know BL sometimes goes off on interesting tangents; however, having recently read Mitchell's other Cain novels it's patently obvious that a lot of 6th edition rules ideas and other fluff came from his stuff.

Combine that with all of the Necron fluff changes which show internecine fighting and I'm of the opinion that the next codex is going to feature a fair amount of 'nids fighting 'nids.

The 'Nids are lead by one single Hive Mind driving them on one single purpose, it would make no sense for it to have them fight each other. If what you are suggesting is true, to me it would suggest one of two things, either independently thinking Hive fleets, or more than one Hive mind, and each fleet is from a different Mind, which is a scary, scary thought.

Eldercaveman wrote:

clively wrote:
I recently read a book that, if ultimately accepted as canon through a new nid codex, will throw an interesting wrinkle in the Hive Fleets.

The Last Ditch by Sandy Mitchell

Spoiler:

A mechanicus installation had some captured 'nids on ice that included parts of a bio ship.

The installation was faced with a hive fleet invasion from a different hive fleet. Interestingly, the hive fleet spent a considerable amount of resources attacking the installation in order to destroy the bio ship pieces and captured 'nids.

The book basically says that the hive fleets don't get along and will attack each other on site. It even goes on to say that the bio ships from different hive fleets can interfere with each other. Now, if multiple fleets are heading towards Terra then it stands to reason that more conflicts like this are going to happen.

If this is held as canon then the Imperium could be saved if they can distract those fleets into a civil war while picking off the outliers.

I know BL sometimes goes off on interesting tangents; however, having recently read Mitchell's other Cain novels it's patently obvious that a lot of 6th edition rules ideas and other fluff came from his stuff.

Combine that with all of the Necron fluff changes which show internecine fighting and I'm of the opinion that the next codex is going to feature a fair amount of 'nids fighting 'nids.

The 'Nids are lead by one single Hive Mind driving them on one single purpose, it would make no sense for it to have them fight each other. If what you are suggesting is true, to me it would suggest one of two things, either independently thinking Hive fleets, or more than one Hive mind, and each fleet is from a different Mind, which is a scary, scary thought.

The way I took it was a shift away from a single Hive Mind into each fleet having it's own that it has carried with it in the form of the Bio Ships. However, I would love to hear others opinion after reading that book. It just seems to me that a fair amount of the BL books tend to throw interesting ideas out there to gauge reception. But that would require probably more planning that GW is actually capable of.

 ALEXisAWESOME wrote:
And Macragge was the shining home world of Matt Wards butt buddies held by a ''god of war'' and tactical genius. With the ''best chapter'' protecting it, look what happened there? Almost beaten by a single hive fleet.

I agree if the terra had time to amass the QUADRILLIONS of imperial guard to defend it might win (but more biomass after all...) and every world in the sol system would be a fight worse then Macragge but if the tyranids came in force. And i mean in total force, they could over whelm the terra. Or worse, if they got there before the QUADRILLIONS of imperial guard and marines then the massive shadow in the warp would block out the astrominicion for the entire universe. Thats like half the imperial assets lost in the warp. Good luck defending it now.

Yep behemoth destroyed macrages orbital defenses and pretty much crushed the polar fortresses. Now that they know a war masters tactics they have a plan. Instead of just expending biomass by throwing themselves at the enemy.

Your also assuming Thre forces of chaos would let this happen. The Dark Gods KNOW they need the imperium to survive so its very likely that as the Tyranids try to launch a attack on Terra that the forces of the TRAITOR legions and all the DAEMON legions show up within one giant warpstorm to fight the Tyranids. Now just think the might of all the traitor legions and renegade chapters COMBINED with all the Daemonic legions of the dark gods. I think that alone would **** the tyranids over never mind if the Outcast decides he dosent like the Tyranids

Captaintyrius wrote:
Your also assuming Thre forces of chaos would let this happen. The Dark Gods KNOW they need the imperium to survive so its very likely that as the Tyranids try to launch a attack on Terra that the forces of the TRAITOR legions and all the DAEMON legions show up within one giant warpstorm to fight the Tyranids. Now just think the might of all the traitor legions and renegade chapters COMBINED with all the Daemonic legions of the dark gods. I think that alone would **** the tyranids over never mind if the Outcast decides he dosent like the Tyranids

Except the warp would be effectively shut down, if all the Tyranid Hive fleets emerged on Terra at once, the shadow would be undeniable.

Eldercaveman wrote:

Captaintyrius wrote:
Your also assuming Thre forces of chaos would let this happen. The Dark Gods KNOW they need the imperium to survive so its very likely that as the Tyranids try to launch a attack on Terra that the forces of the TRAITOR legions and all the DAEMON legions show up within one giant warpstorm to fight the Tyranids. Now just think the might of all the traitor legions and renegade chapters COMBINED with all the Daemonic legions of the dark gods. I think that alone would **** the tyranids over never mind if the Outcast decides he dosent like the Tyranids

Except the warp would be effectively shut down, if all the Tyranid Hive fleets emerged on Terra at once, the shadow would be undeniable.

That assumes that the Emperor does diddly squat to try and combat it

@Eldercaveman it does say in the Chaos Daemons book tho that the gods can create warp portals at will however they basically wont do it to often as it weakens them.

I very much doubt the emporer would give a damn if the forces of chaos were attacking the Tyranids infact he would probably let them

Captaintyrius wrote:
@Eldercaveman it does say in the Chaos Daemons book tho that the gods can create warp portals at will however they basically wont do it to often as it weakens them.

I very much doubt the emporer would give a damn if the forces of chaos were attacking the Tyranids infact he would probably let them

I don't think he would let the Daemons get that close to Terra, even if the Daemons want mankind to survive, I don't think the Emperor (assuming he is more than a corpse, that has more than residual psychic energy left to keep the astronomican going) would humor the Daemons that close, especially not the traitor legions/

What about the sisters of silence? They are all psychic blanks based on Luna, what effect would they have on tyranid synaps creatures in battle? The silent sisterhood strike teams could throw enough confusion into a hive fleet to tip the balance.

Ugly Green Trog wrote:
What about the sisters of silence? They are all psychic blanks based on Luna, what effect would they have on tyranid synaps creatures in battle? The silent sisterhood strike teams could throw enough confusion into a hive fleet to tip the balance.

I don't think the Nids draw power from the warp in a conventional sense, it stead it is challenged through the synapse creatures, by the hive mind.

In one fo the caphias Cain novels when Jurgen - a blank- (I think that's the adjutant's name) approaches a synapse Tyranid it inflicts pain on the bug.

it could be that the Hive Mind uses the warp to communicate (Like subspace is used in B5) and a blank cuts them off from that connection

Eldercaveman wrote:

Ugly Green Trog wrote:
What about the sisters of silence? They are all psychic blanks based on Luna, what effect would they have on tyranid synaps creatures in battle? The silent sisterhood strike teams could throw enough confusion into a hive fleet to tip the balance.

I don't think the Nids draw power from the warp in a conventional sense, it stead it is challenged through the synapse creatures, by the hive mind.

I was given to understand (maybe in complete error) that the reason the shadow in the warp happened was because of the vast amount of psychic energy being used by the tyranid synaps creatures. I thought that synaps creatures used some form of telepathy, surely this would be disrupted by blanks?

Would never happen as the eldar would detonate all the worlds around terra to stop the nids. The eldar have no qualms about killing the entirety of mankind to stop the nids and chaos. This means that the nids would not devour the biomass leading up to the conflict with terra.

If they did reach they would reach as tendrils. That means lots of time to prepare as the sol system is practically a giant fortress designed for the sole purpose of guarding the big E and the high lords.

So, the IoM would go exterminatus on the planets them selves if they felt the need, which they would if faced with a full on incursion aimed at terra. So the most likely turn of events is a withdrawal action wiping out the planets in the path of the tyranids taking as many as possible with them and then a full on conflict just outside sol system where the tyranids face the full might of the IoM with eldar, tau, and possibly even Deldar/ork support (probably indirect as the IoM would not allow them near sol but even in-cutting the rear of the hive fleet would be devastating) Not to mention the chaos gods would probably be let loose in places that the IoM withdrew from.

The tyranids might win in the end but that would take thousands of times more forces than they currently have in galaxy and the assumption that these reinforcements come in successively larger waves. If this assumption is not true then they will never make more progress than they currently have been as they seem to only do lasting harm to the eldar.

The really interesting question is would the end result be the fall of IoM that would likely be inevitable (with the above assumption) when the big E is left with a single system intact. Would the void dragon awaken due to the conflict or would the chaos daemons be unleashed? and do the necrons kill nids as fervently as they do everything else?

btw tell your mother she should not put blankets on lightbulbs they do not block all of the light (depends on the blanket) and they tend to burst into flames and burn the house down, very unsafe(google it)...hmm somewhat like what would probably happen between the nids and big E.

Eldercaveman wrote:

clively wrote:
I recently read a book that, if ultimately accepted as canon through a new nid codex, will throw an interesting wrinkle in the Hive Fleets.

The Last Ditch by Sandy Mitchell

Spoiler:

A mechanicus installation had some captured 'nids on ice that included parts of a bio ship.

The installation was faced with a hive fleet invasion from a different hive fleet. Interestingly, the hive fleet spent a considerable amount of resources attacking the installation in order to destroy the bio ship pieces and captured 'nids.

The book basically says that the hive fleets don't get along and will attack each other on site. It even goes on to say that the bio ships from different hive fleets can interfere with each other. Now, if multiple fleets are heading towards Terra then it stands to reason that more conflicts like this are going to happen.

If this is held as canon then the Imperium could be saved if they can distract those fleets into a civil war while picking off the outliers.

I know BL sometimes goes off on interesting tangents; however, having recently read Mitchell's other Cain novels it's patently obvious that a lot of 6th edition rules ideas and other fluff came from his stuff.

Combine that with all of the Necron fluff changes which show internecine fighting and I'm of the opinion that the next codex is going to feature a fair amount of 'nids fighting 'nids.

The 'Nids are lead by one single Hive Mind driving them on one single purpose, it would make no sense for it to have them fight each other. If what you are suggesting is true, to me it would suggest one of two things, either independently thinking Hive fleets, or more than one Hive mind, and each fleet is from a different Mind, which is a scary, scary thought.

We actually don't know that for sure. There's no definitive statement of what the Hive Mind truly is, though it *seems* to be a gestalt consciousness formed by the totality of all Tyranid bio-forms in a given Hive. There may or may not be a single individual creature somewhere at the back that is the actual Hive Mind entity. Based on the concept of it being localized to the members of a given Hive Fleet, if two Hive Fleets encounter one another, they're now in competition for the bio-mass of a target planet, and are also viable food to each other. If they join forces to eat one world... well, that's not enough food for both of them. One is going to have to eat the other after the bio-mass expenditure of travel and then battle for the world. Otherwise... they both starve.

If Tyranids reach Terra, then they will eat like kings. Then leave gassy and bloated and end up with that 'too full' feeling where you don't want to get off the couch and do anything. eventually falling asleep.

Do Genestealer cults exist in the Sol system? Could they exist?

Sure, the overall security would be second to none, but you have a lot of space traffic to and from the planets. Pilgrims, soldiers, traders etc. Mistakes happen.

Maybe a cargo hold isn't holding just foodstuffs. Maybe one of the pilgrims is expecting, and the father was a charming man who didn't seem quite right. Maybe one of the nobles smuggled in a fascinatingly vicious creature for its menagerie that seems to always be testing its cage.

Hundreds of billions of humans to hide in. Could be the Tyranids have already reached Terra.

Could be.

A shard? The thing under the Noctis Labyrinthus is a whole C'tan.

Think about it. None of the Shard powers are related to manipulating machines, which we know is the Dragon's speciality.

Mechanicum has a dream sequence from the Dragon's point of view in which it was a Star God, unbound by Necrodermis, until a Golden Warrior defeat it and cast it down to be bound under the soil.

No other C'tan 'Shard' has specifically prompted a Necron raid - the largest canonically known battlefleet fielded by Necrons (Admittedly, that does mean "Two ships") - against such a highly defended target. The Necrons managed to land a Shroud-class cruiser on Mars itself.

Would the Tyranid risk waking up an unbroken C'tan? They avoided a Tomb World. It's never been retconned that the 'nids target Necron worlds, despite the 'new' fluff (which is less different from the old fluff than people like to think). There's very little biomass on Mars as it is.

On top of that, even if they C'tan remains dormant, Dalia is still on Mars, with the full power of the Dragon available to her should she need to call upon it. A human with a natural connection to the Source of all Knowledge, wielding C'tan reality-warping powers. Even if in the last ten thousand years, Dalia's found a replacement guardian, that still leaves a human with a C'tan's power standing watch over Mars.

Of course, there's always the possibility of a billion hive ships just coasting in and smashing everything aside with their bulk.

Terra is one hell of a fortress, it's a tribute to the paranoia of the Imperium.

However we know the Nids have consumed multiple *galaxies* (Number unknown to keep it mysterious), thats a lot of biomass any way you look at it. Thanks to Leviathan we also know they are encompassing the galaxy as at least some of them are coming from underneath not just the galactic east. They are often descibed as jaws tightening around the galaxy. Who knows where the next major fleet will strike.

Leviathan is the most recent and largest to date so the threat is growing.

Narvhals cause massive tectonic upheaval and Nids can spawn whatever they need. They could spawn a fleet of them and point them at Terra. Biomass wise it's a drop in the ocean but it could devestate the planet without sending your troops anywhere near. The blow to Imperial morale seeing large parts of Terra in ruins...

Now excluding magic Emperor brain popping, which frankly I think is way beyond him, since he apparantely could even stop 5 light necron ships on their way to Mars I personally think the Imperium is in trouble.

The Nids started out simply charging worlds like Macragge head on but have since grown far smarter and far more cunning. The Hive Minds agents like the Swarmlord now understand Imperials well enough to outwit Calgar at every turn. Also who knows what secrets Tigerius gave up when he looked into the Hive Mind, he saw into it but never even stops to consider whether it saw into him...

The noose is tightening year by year as more worlds are lost and while they can exterminatus and the Eldar can burn whole imperial worlds not every world is Imperial. The Orks, Tau and all those minor races in the galaxy wont go quietly, the Imperium will have to fight them to destroy those worlds. Any world with a hint of rebellion may not be so quick to lay down their lives either and the Dark Gods and Tau emissaries will become very popular all of a sudden.

All the while the Imperium is bleeding war resources and it has many other enemies. Chaos is safe in the Eye and would totally take advantage, the Orks who weren't fighting Nids too so now the Imperium is fighting on two fronts. The Eldar may come to their aid or may finally simply give up on the Galaxy and either flee into the darkness between stars or into the webway and try and wait it out. They may not get on with their dark kin but they are Battle Brothers and the same people, they either need to make peace or die. I doubt they'll get a good deal from the DE but they may live to see another day. The Necrons are largely avoided by Nid's so what would they care, they'd likely go back to sleep till it's over and then retake the galaxy once the nids are gone. Only the Silent King would even notice.

The Nids won't rush Terra, they are winning the war and have only just begun bringing their force to bear. The Imperium will crumble and if they are lucky may mount a last expensive defence of Sol come the end. If they aren't the Golden Throne will break down before the Nids arrive and the Imperium will collapse without a shot fired as they lose all warp travel, their spiritual leader and their defence against the Daemons all in one swoop...

 Furyou Miko wrote:
The Necrons managed to land a Shroud-class cruiser on Mars itself.

This was retconned by 5'th edition Necron codex fluff. Not only that Necrons ships are slower than Tau ships ( they literally need decades to reach nearest star system ) but Imotechs entire space armada was defeated by Black Templar strike fleet. The text even says that Necron ships were fleeing from Space Marine ships that destroyed them mercilessly.
Giving this incident the Necrons simply don't posses power to stand against Imperial Navy battlegroups ( who are much, much stronger than Space Marine ones ) and they cannot just "pop up" near Mars because they don't have their fast FTL anymore.
So Necron Mars raid from 3'rd edition codex edition never happened.


Automatically Appended Next Post:

 Dunklezahn wrote:

However we know the Nids have consumed multiple *galaxies* (Number unknown to keep it mysterious), thats a lot of biomass any way you look at it.

Actually we know the exact number - 12 ( Tyranid codex, rulebook entry ). And no matter if they gathered a TON of biomass, the travel between galaxies are LONG and they lost a LOT of it on the way.

Leviathan is the most recent and largest to date so the threat is growing.

The actual quote goes "The last and latest Hive Fleet", not the last part. That could mean that Leviathan is indeed the last large Tyranid fleet in existence, the other ones begin small fleet like Gorgon. Is this Crudance's type mistake or something else we don't know, but we know about it's plans a lot.

1/3'rd of Leviathan is already destroyed at Tarsis Ultra ( the entire fleet divided into 3 parts ), the other two are going toward Baal and Terra.
Leviathan will be destroyed in 42'nd millennium, Terra cannot be breached and Blood Angels will have most of their successor Chapters defending Baal. If undermanned Ultramarines can destroy Behemoth then Blood Angels at full strenght + several other chapters can stop this part of Leviathan.|

I can't wait to read about this one day, the Battle for Baal and 2'nd Battle for Terra will be as much if not more epic than Battle for Macragge.

Remember there's also a huge choas horde heading for Baal lead by M'Kar, not so straight up but even the renegade BA successor have shown up. Could just end up with very few survivors. Either way any victory will be costly

While the Emporer may not like the thought of letting the traitor legions and the Daemons near terra he may also realise it may be humanities only hope. I mean lets face it Greater Daemons are more powerful than any tyranid and are in fact harder to destroy.

The tyranids so far have inflicted only the lightest damage on the Imperium, and have time and again collapsed in the face of all but the very lightest and haphazard defenses. The Imperial navy, when it engages them with any halfway decent fleet butchers them, and on the ground the guard tend to as well (such as four thousand guardsmen and some PDF troops taking out a splinter fleet, only losing about half their number in the process). Their hardest problem has been one of predicting where the tyranids will strike early enough that they have time to move available assets to counter them.

Were a force several times greater than the sum of all hive fleets to date (which, attacking the most vulnerable and ill-defended targets it can, has inflicted, has destroyed less than one hundredth of a percent of the Imperium, all of it far-flung backwater) to move against Sol, it would very likely be mauled before it even got close, and if it somehow wasn't (or it was sufficiently large that even after it's inevitable downsizing it would still be greater than all the hive fleets to date), it would still smash itself apart upon the system defenses, then turn upon itself in confusion as the controlling nodes are slain.

And Macragge was't so much an "epic" battle as it was a pathetic one: the ultramarines turn tail and flee almost immediately, with their leader abandoning the planet altogether in order to intentionally stumble into a trap he had no power to defeat, with only the timely arrival of Imperial Navy warships saving the ultramarine fleet. At which point they return to Macragge to mop up the scattered remnants of the ground forces (remember that the ultramarines fled in the earliest stages of the battle, and died in the middle of nowhere (as in, not fighting the main host in the populated regions), meaning the PDF were the ones to rout the tyranids after having been abandoned by their leaders).