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Heya folks!
A friend of mine’s is looking to get into 40K, but the one unit he has and really loves, the Horus Heresy era Myrmidon Destructors from the Taghmata Omnissiah list are not available for the modern Mechanicus. So I had some inspiration this morning and made a 9th edition datasheet for his boys, and I was wondering what more experienced rules-people might make of this homebrew.

The logic of my conversion to ninth edition:
Movement: they have the old bulky special rule, so I would say 5” is fair
Wounds: in HH they are 2W models, which are tough and rare. In 9th I’d say that’s 3 or 4 wounds a piece. SM Centurions get 4, so do the myrmidons.
Centurions are in fact a good baseline. Cents get 2+ save, myrmi’s 2+ BS, past that they are very similar slow gun platforms.
Lumbering advance is a bad thing, but the 5+ invuln is nice, so only a few extra points over a centurion.
Preferred enemy became the new infravisor (none of the old infravisor rules make sense in 9th, and I like the name better for fluff), relentless is no longer relevant. Ignored stubborn, enough rules as they are.
Conversion beamer is an actual 9th ed gun, so just copy pasted those rules.
Mechanicus has volkite weapons in 40k, copied those rules, but with the range and shots of the original.
Rad Engine was a torrent weapon, so a souped up 18” heavy flamer with bonusses to infantry makes sense to me. Turned into quite the Primaris mulcher. ^^
Proton gun: plasma lascannon, essentially
I’m not happy with the imploder, it seems fairly meh compared to the rest…

So, without further ado, the datasheet:

Mechanicus Myrmidon Destructors (Heavy Support, Homebrew 9th Ed stats)

Name M WS BS S T W A Ld Sv
Myrmidon 5” 3+ 2+ 4 5 4 2 9 3+
Myrmidon Lord 5” 3+ 2+ 4 5 4 3 10 3+

This unit contains 1 Myrmidon Lord and 2 Myrmidon Destructors. It can additionally contain up to 7 additional Myrmidon Destructors. Every model is equipped with: power fist, frag grenades; krak grenades; conversion beamer.

Range Type S AP D Abilities
Power Fist Melee Melee X2 -3 D3 When attacking with this weapon, you must subtract 1 from the hit roll.
Frag grenade 6” Grenade D6 3 0 1 Blast
Krak grenade 6” Grenade 1 6 -1 D3 -
Conversion Beamer 42” Heavy D3 6 0 1 Attacks from a conversion beamer that target enemies at over half its range are resolved at Strength 8, AP -1 and Damage 2.
Graviton Imploder 18” Heavy 2 5 -1 D3 If this model remains stationary in the movement phase, it may fire this weapon twice.
Irradiation Engine 18” Heavy 2D3 4 -2 2 This weapon automatically hits its target. When attacking a unit of INFANTRY, you can re-roll failed wound rolls for this weapon.
Proton Thruster Cannon 48 Heavy 2 9 -3 D6 On a hit roll of 1, the bearer takes 1 mortal wound.
Volkite Culverin 45” Heavy 4 6 0 1 Each time you make a wound roll of 6+ for this weapon, the target suffers a mortal wound in addition to any other damage.

Wargear Options
Every model may replace the conversion beamer with 1 of the following weapons: Graviton Imploder, Irradiation Engine, Proton Thruster Cannon or Volkite Culverin. You may mix weapons.

Abilities
Canticles of the Omnissiah (pg x)
Lumbering Advance: Models in this unit may not advance, but do not suffer the penalty to hit rolls for moving and firing Heavy Weapons.
Refractor Field: This model has a 5+ invulnerable save.
Ancient Infravisor: You can re-roll hit rolls of 1 in the Shooting phase for this model.

Faction Keywords
Imperium, Adeptus Mechanicus, Relic, <Forge World>
Keywords
Infantry, Myrmidon Destructors

Points
Myrmidon: 110 pts
Myrmidon Lord: 110 pts
Grenades: 0 Pts
Power Fist: x pts (see the mechanicus codex, real points, not posting them for the usual reasons)
Conversion Beamer: x pts (see the astartes codex, real points, not posting them for the usual reasons)
Graviton Imploder: 25 pts
Irradiation Engine: 25 pts
Proton Thruster Cannon: 30 pts
Volkite Culverin: 20 pts

I was gonna say "They look kinda OP."

Then I saw your points costs.

They're definitely a powerful unit, but at about 150 points per guy, I don't think they're OP. If anything, the opposite-that's close to 40 points per T5 3+/5++ wound.

They are on 40mm based, no? I would stat them at something closer to terminators or aggressors if that's the case, maybe only 3 wounds.

As far as special rules go, I think the infravisor is way too good when combined with BS2+. I would either keep the infravisor the same but make them BS3+ or make the infravisor do something like "add one to hit rolls for this unit when it suffers negative to hit modifiers", I prefer the former.

For the weapons, I think you have the volkite culverin's rules wrong, 45" S6 AP-1 D2, d3 mw on wound rolls of 6. Its 30 points on vehicles in the AM codex, so probably still 30 points on BS3+ infantry. The graviton imploder is the only other weapon that I am not sure about, it looks really weak and kind of redundant compared to other options. I would suggest just turning it into a grav cannon with a default d3 damage that can escalate to d6 against 3+ save enemies, it would probably still be good at 25 points. All the other weapons look nice and have a good points cost.

This brings up the points cost of the models as a whole, as JNAP says, 110 points is insane for a unit that is less powerful than obliterators, which are cheaper and don't pay for wargear. If you stat them with my suggestions, 40ppm at most would be good before wargrear. Kataphron destoryers are only 20 points and are very similar, but they are only BS4+ with a 3+ save. If Myrmidon Destructors came in the indomitus box, they would probably be only 30 points each, which is about as low as I would point them.

Heya guys, thanks a bundle for lending your brainpower.

They are on a 40mm base I believe, but my logic with taking a centurion as the baseline comparison in stead of a terminator was as follows: I wanted something that was worthy of the Heavy Support slot and not the Elites slot, a type of unit the Mechanicus doesn't really have yet (like you yourself pointed out, dropping some stats gets them closer and closer to Kataphron territory) and in the Heresy game, these guys blow terminators of all kinds out of the water (and are 20-40% more expensive).

We played a few matches in 7th (just copying the Heresy rules for these guys), so he knows to expect they hit on 2's, rerolling ones. Suddenly nerfing them to a 3+ feels a bit jarring to be honest. I get your point, don't get me wrong, but maybe I just need to adjust to the tought of changing the stats.

You're both pointed out they are indeed very expensive. I think I might have overestimated how much I should ask for an invulnerable save. If I bring down the base model to 70 points (keeping the stats for now), equip it with a proton thruster, it ends up being 110 pts, 5 points more than a dev centurion with dual lascannons. Myrmidon has far better hit options and the invuln, but the centurion has an additional weapon, so it evens out I think. Would you gents agree?

You found the culverin in the Imperial Guard Codex? I just went through it again, but I can't find it, only the vanquisher, volcano cannon and vulcan mega-bolter are in my codex. Am I looking in the wrong place? The stats I copy-pasted I found the Mechanicus part of Battlescribe (don't have the army myself ) on the Tech Priest Dominus, the Volkite Blaster. I used those rules, S AP and D, and used the range and number of shots of the Heresy era Culverin to get to this.

Ah, the grav cannon rip-off idea is great!
Range Type S AP D Abilities
Graviton Imploder 24” Heavy 4 5 -1 D3 If the target has a Save characteristic of 3+ or better, this weapon has a Damage characteristic of D6.
25 pts, worse range and 1 shot less than a normal grav cannon, but far better damage and a little more expensive.

Glad I could help.

I think these guys would be in a different category from battle servitors anyway by virtue of a much better save, better BS, and worse movement, as well as being mostly independent of character support. And they would still be better than gravis units with those stats (except maybe the eradicators, but those are completely broken). But if you are wedded to those stats, then 70 ppm would be good, it's 25% more shooting and 33% more wounds than my suggestion for 37.5% points.

As for the weapons, the rules for the volkite culverin would be in Imperial Armour Index: Forces of the Astra Militarum, but I stumbled across it in under the IG's carnodon tank, which is the only unit able to take one, I think.

Also, the grav cannon (both the heavy (admech) and amped (SM) variety) is AP-3, so I would push your's up to AP-2 at least, maybe make it 30 points if you would feel better about it. Grav is kind of OP in 9th since it got points cuts when everything else got a points hike. But I would say all these weapons look good and fill an important niche; long range AT for the proton cannon, short range AT for grav, long range anti-infantry for Volkite, and short range anti-infantry for the irradation engine. the conversion beamer doesn't really fill a niche though, it's outclassed by every other gun. Maybe change it to a heavy conversion beamer with 1d6 shots? I don't know, that's more balancing consideration than GW would give it.

I love these models, but since GW hasn’t gotten around to giving us 40K versions, I use them as Kataphron Destroyers. They look 100% better than the actual tracked model and you don’t have to come up with custom rules and point costs.

I might try out your version, if I can convince my opponent to try some home-brew units.