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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My shifting projects