In the shallows of the Eye of Terror lies the Daemonworld of Ddywensac. A dark and fearful place, the planet is one of the Heretek Forges, trading weapons and demon engines to all factions in return for resources and security.
Historically, the centre of this activity is the spires of Hive Usk, where the current Dark Magos controls the flow of energy and souls through her domain. Rebellions and schisms are common. A minor faction have taken control of the Stygian Canyon Manufactorii, exploring the effects of weaker binding upon demon engines. This horrendously unstable research has been banned, with the practitioners moving to outright rebellion. This could be framed as a philosophical debate within the Dark Mechanicus, albeit one that will shape the future of warfare for many systems around it.

Both sides are racing to complete and unleash as many super heavy demon engines as possible. The rebels have enlisted the cultist surface tribes to swell their numbers, whilst the Magos has requested the aid of a chaos titan legion in return for a base on the planet’s moon. The Titan Legion has landed but seems to treat both sides in the conflict with equal contempt.

The Ordo Malleus is also increasingly concerned about the creation of unbound demon engines and proposes a strike raid into the Eye of Terror itself, aiming to eliminate the rebels and ensure the remaining factions are unable to consolidate in victory.
Inquisitorial Stormtroopers and a Penal legion would be the main assets spent.

Would the Grey Knights commit to such a foolhardy suicide mission?

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The real question is: How does the Imperium know about a civil war on a Daemonworld inside of the Eye of Terror?
But iirc the Grey Knights DID invade Daemonworld sin the past but iirc not in the EoT itself?

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Why not just virus bomb them all?

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Won't work on daemons.

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Cyclonic torps, then. I just don't see a need to engage on the surface.

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Following this and other feedback on warseer, I'm seriously considering dropping the imperial involvment.

But that only leaves three lists:- Any other chaos lists i should look at working into the storyline?

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Nothing wrong with three lists, IMO. Raiders had three lists. Three suffices. Four is plenty. More is just getting extravagant.

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Well, there's a lot of lists in development, and I don't think any of the chaos lists have been actually published yet.

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I doubt every list will see supplement form. Not sure it's a bad thing. I mean, there's only so many variants of "and then the Guardsmen all died semi-valiantly" that are possible in the English language.

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Suicide mission? They'll carve their names on the Dark Magos' heart and mail it to the nearest Adeptus Sororitas convent, with roses.

Let's face it, Mat Ward has given Grey Knights story writers a lot of leeway. Even without that, they should be able to carry out the most extreme missions of any Imperial forces. So no problem there. The only thing that stands out as odd is any part of the Dark Mechanicus banning (or even disliking) unstable research involving daemon engines.

Based on the snippets of information we've got, there appear to multiple dark mechanicus schools of thought:

Some cling to the Omnissiah as the Primodial God from which the other gods descend.

Some consider the Omnissiah to be one god amongst five, although naturally he's the 'best god'.

Some would follow the Iron Warrios mindset - that chaos is weak and worship is for fools, that the only acceptable use for demons is to be bound into weaponry, not as troops themselves.

If you're the head of a huge, sprawling mechanicus hive, committed to multiple contracts to various powers hostile to each other and just as likely to raid you as pay, I think you'd prefer things to stay reasonably simple on the ground, and not give demons the chance to wander the surface...

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