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Hey guys, I'm writing up some fluff for my SM chapter and had the idea of a Daemon-Possessed Marine, who keeps his mind and self by being perma-sealed Rubric of Ahriman style in a suit of Grey Knight armour.

I know the Aegis works on outside influences, but can it/has it worked on keeping something sealed -within-?

I thought it was a neat little idea, but I don't want to butcher fluff, even if its my own

While there are no canon examples of anything similar in the lore...

There is nothing that says that it explicitly can't happen. At least as far as I know.

I don't know, sounds alright to me personally.

*Hides in bunker and waits for that one guy that has read every book ever published and knows everything to prove me wrong*

Sounds cool I guess. but ... What's stopping the daemon eating his mind?

I also could be wrong, but the hexigramic warding in Aegis suits are anathema to daemons. Touching them causes immense amounts of pain (think old school silver and werewolves, or classical holy water and daemons). so locking a possessed marine in a Aegis suit would result in a maddening amount of burning torture that the marine couldn't effectively do anything.

Also, the Rubric's probably a bad simile - the Rubricae were tured to dust by the spell.

GKT has a point, but I will note that if Repentia can charge into battle and fight while being scourged with neural torture implements powerful enough to kill people at a touch and cut through power armour, a Grey Knight might be able to cope with fighting while being immersed in acid, which is the closest thing to being a daemon in an aegis suit I can think of.

TheManWithNoPlan wrote:
While there are no canon examples of anything similar in the lore...

There is nothing that says that it explicitly can't happen. At least as far as I know.

I don't know, sounds alright to me personally.

*Hides in bunker and waits for that one guy that has read every book ever published and knows everything to prove me wrong*

I'm not that guy, but...

In a short story in the middle of Hammer Of The Emperor, there is an example of an amniotic tank inscribed with wards that has a daemon inside. Therefore, we know that anti-Daemon wards work both to keep things inside and outside.

The Aegis Suit wards are definitely more powerful than the wards the AdMech were using in that story, so I'd give the OPs idea a yes, a daemon can be sealed inside armor.

Therefore, we know that anti-Daemon wards work both to keep things inside and outside.

Yes, but that's a different kind of ward. Pentagrammatic Wards are used to keep things in, Hexagrammatic to keep them out.

The most important thing for this story to remember is that the GK do not just give suits of their special Power Armor away. To anyone. For any reason. The fact of their existence is a closely-guarded secret. There are entire Chapters of Space Marines that do not know the GK exist. There have been entire Regiments of IG executed, with full honors, after battles the GK have appeared at.

Daemon-possessed Marine? Psy-cannon round to the base of the skull, problem solved. The GK do not let daemons just run around, doing daemony things.

That's alot of replies guy, thanks.

I figured that imprisonment within the Aegis would cause inhuman levels of pain for the Marine, but, they are Space Marines, I figured they could handle it.

As far as the warping his mind stuff goes, I already accounted for that and there would be changes in the Marines Psyche, inner monologues with the Daemon, that sort of thing.

Also, I know how guarded the GK are with their Aegis armour, and I wouldn't dare break fluff by them giving a suit away, my chapter would.. "recover" such a relic and my Master of the Forges and Techpriests would repair and engineer it (Tech-Heresy? Probably, but for the greater good).

Sounds like a radical inquisition thing.

Maybe tie them into the whole story of it.

I doubt it would keep the Daemon sealed up without additional measures. But it would be one hell of a torture device, likely enough to make the daemon leave(depends on the daemon's power) and drive its host insane.

But its one of those things thats not going to happen. It would involve someone getting their hands on some GK armor AND having a possessed marine AND getting the idea to build this sort of weird mobile prison AND having the knowledge and ability to alter the wards that could hold the daemon in place. Thats knowledge that only a handful of people in the universe would know about, much less have the ability and inkling to act on.

 jhe90 wrote:
Sounds like a radical inquisition thing.

Maybe tie them into the whole story of it.

Heh, actually the Inquisition plays a part in the events of my story already.

You see, my Chapter homeworld do not necessarily venerate the Emperor as a God like the rest of the Imperium, we're more "Praise the Omnissiah" since the homeworld was originally discovered by one of the Mechanicus explorer fleets.
Inquisition come to discover more about cult happenings, clash with the planetary rulers, etcetc.
I actually have a little quote I'm using when the Astartes Chapter Master clashes with the Inquisitor which summarizes my chapters feelings nicely I think

"What would you know of our Fathers will Inquisitor? You are not of his blood, nor would you ever be and yet you question MY allegiance? Our Father remains in this world by the will of the Omnissiah, and for that he has our eternal devotion."

@Psienesis, could one place a pentagrammic ward and cover it with a hexagrammic one, so the daemon is stuck inside and nothing else could get in, two way protection? I'm not an expert at this by any means, so feel free to prove every aspect of this idea wrong (within reason, of course)

Lets say the Aegis can keep in a Daemon at this point.
The other issue would be neutralizing the Psychic potency of said Daemon.

Now, without having a Blank follow my Marine around 24/7, are there in-universe examples of Blank-type technology? That way his armour could be modified to include such tech. The Daemon would still talk to the Marine and attempt to influence him, but the Daemons Psychic potential would be nullified.

In eisenhorn there is an example of an alpha plus psyker who gets loose from the collar he is wearing that dampens his psyker power. So yes there is precedent for pyker dampening restraints