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From my understanding, the Rubric was aimed at those who had very little to no psychic ability, but did it only affect those that were on Prospero with Ahriman? Or were all of the Thousand Sons (excluding the sorcerers) in existence affected by it?

I like to think that it was only those in proximity to Ahriman, as I'm basing a whole army's concept on that lol. Honestly not sure though...

as far as we KNOW it impacted the entire Legion, but.. we dunno everything. for all we know the rest of the Legion turning to dust was eaither A: a proximity thing. B: the effects of the warp on them. C: actually just the price tzeetch exacted for the ritual. and was actually simply "X number of members of the Legion"

Pretty certain it was the entire Legion. That's why Magnus was so pissed about it. It turned basically all of his sons into dust, save for those with enough psychic potential.

If you want to do an army based on Marines that weren't affected by the Rubric then I'm sure there are plenty of little fluffy explanations. Perhaps your dudes were behind some mighty psychic shield at the time.

Oh, @BrionDavion. Absolutely love the idea that the turning to ash was jsut the price Tzeentch exacted for the ritual. Really nice idea that

Here's a question. Is the Rubric an active spell? So, if you took the geneseed of a living Sorceror and created a new Marine, would that Marine then turn to dust if they had no psychic potential? That'd be nice and grimdark I feel.

If not, that'd be another fluffy way to have living KSons. Perhaps there's a sect that's trying to rebuild their Legion ever so slowly using the minimal geneseed they can extract from their sorcerors.

Well we really don't really know where the Rubric of Ahriman took place, how potent its was, how many TS was present, etc.

We know in the fluff that certain elements of the TS, e.g. what became of the Blood Ravens, were not present/not victims at the Burning of Prospero. So its very possible that a bunch of TS were still roaming the galaxy. Either as parts of expeditionary fleets, loyalist bands, blackshields, warlords, etc.

Also I had the impression that the rampant mutations only occured on the Planet of the Sorcerers due to it being inside the warp. By the train of thought the Rubric only affected TS on the planet.

I see no reason why a lot of TS stayed flesh and blood. Whilst loads were on Prospero, and became Rubric Marines due to Ahriman - we can't assume it was the entire legion. The fluff isn't 100% about numbers.

The Rubric took place on Sortiarius, not Prospero.

@Ynneadwraith: I feel like it is an active spell. Ahriman kills Amon by unleashing the power of the Rubric already within Amon, so we know that it is at least still active within anyone who were originally affected by it. Who knows if it would actually carry over from their geneseed though.

We know that the Rubric took place on the Planet of Sorcerors and that it affected every Thousand Son who was on the planet. Those were weak were turned to dust and those were not were made immune to mutation (supposedly) and had their psychic abilities boosted. It is unknown if at affected any Legion members off world as most sources for the Rubric that I've seen assume that all Thousand Sons are on Sortiarius at the time. My gut instinct would be that it wouldn't, considering the Rubric is described as a planetwide storm that had to be stopped by Magnus himself.

 dangerzone227 wrote:
We know that the Rubric took place on the Planet of Sorcerors and that it affected every Thousand Son who was on the planet. Those were weak were turned to dust and those were not were made immune to mutation (supposedly) and had their psychic abilities boosted. It is unknown if at affected any Legion members off world as most sources for the Rubric that I've seen assume that all Thousand Sons are on Sortiarius at the time. My gut instinct would be that it wouldn't, considering the Rubric is described as a planetwide storm that had to be stopped by Magnus himself.

This is the interpretation I tend to subscribe to. If any TS were lost off-planet then they would not be affected by the Rubric but would stil have to grapple with the effects of the flesh-change every now and again, making their numbers slowly wither away.

 Aetare wrote:

 dangerzone227 wrote:
We know that the Rubric took place on the Planet of Sorcerors and that it affected every Thousand Son who was on the planet. Those were weak were turned to dust and those were not were made immune to mutation (supposedly) and had their psychic abilities boosted. It is unknown if at affected any Legion members off world as most sources for the Rubric that I've seen assume that all Thousand Sons are on Sortiarius at the time. My gut instinct would be that it wouldn't, considering the Rubric is described as a planetwide storm that had to be stopped by Magnus himself.

This is the interpretation I tend to subscribe to. If any TS were lost off-planet then they would not be affected by the Rubric but would stil have to grapple with the effects of the flesh-change every now and again, making their numbers slowly wither away.

I read somewhere that the Flesh change was a curse by Tzeentch that was ended by the Rubric. Tzeentch would have used this curse to get what he wanted, which was the casting of the Rubric. Since he got what he wanted, his own legion of mindless marines, it's possible the curse was ended. This would allow all those TS who were sent away before the attack on Prospero, the chance to survive. It's also possible that this too was part of Tzeentch's plan, a chance for him to take root in another chapter in the far future.

Ravingbantha wrote:

 Aetare wrote:

 dangerzone227 wrote:
We know that the Rubric took place on the Planet of Sorcerors and that it affected every Thousand Son who was on the planet. Those were weak were turned to dust and those were not were made immune to mutation (supposedly) and had their psychic abilities boosted. It is unknown if at affected any Legion members off world as most sources for the Rubric that I've seen assume that all Thousand Sons are on Sortiarius at the time. My gut instinct would be that it wouldn't, considering the Rubric is described as a planetwide storm that had to be stopped by Magnus himself.

This is the interpretation I tend to subscribe to. If any TS were lost off-planet then they would not be affected by the Rubric but would stil have to grapple with the effects of the flesh-change every now and again, making their numbers slowly wither away.

I read somewhere that the Flesh change was a curse by Tzeentch that was ended by the Rubric. Tzeentch would have used this curse to get what he wanted, which was the casting of the Rubric. Since he got what he wanted, his own legion of mindless marines, it's possible the curse was ended. This would allow all those TS who were sent away before the attack on Prospero, the chance to survive. It's also possible that this too was part of Tzeentch's plan, a chance for him to take root in another chapter in the far future.

Interesting theory! I might just have to write that into the narrative then if it's all the same to you Writing up a new army of Pre-Heresy TS just now resurfacing from a warp mishap...

I like to interpret it as any Thousand Son which had given himself to Tzeentch was affected, so all the Chaos Thousand sons without Psychic potential would be Rubricae.

However, the long isolation of Magus must mean that many of his Sorcerers would have created their own personal warbands to roam the galaxy with.
Much like the Red Corsairs and the Black Legion, these could include marines recruited from a variety of sources (even Thousand Sons that fell to Tzeentch later than their brothers, perhaps after being unfairly branded as traitors by the Imperium) and therefore could include fleshy marines exhibiting all the horrific/ blessed mutations that come with swearing loyalty to Tzeentch.

This would be the sort of army I would collect if I ever fell to Chaos, Chaos Spawn, Tzeentch deamon infused war machines like Defilers, and Tzangors could be other appropriate inclusions.

 Kroem wrote:
I like to interpret it as any Thousand Son which had given himself to Tzeentch was affected, so all the Chaos Thousand sons without Psychic potential would be Rubricae.

However, the long isolation of Magus must mean that many of his Sorcerers would have created their own personal warbands to roam the galaxy with.
Much like the Red Corsairs and the Black Legion, these could include marines recruited from a variety of sources (even Thousand Sons that fell to Tzeentch later than their brothers, perhaps after being unfairly branded as traitors by the Imperium) and therefore could include fleshy marines exhibiting all the horrific/ blessed mutations that come with swearing loyalty to Tzeentch.

This would be the sort of army I would collect if I ever fell to Chaos, Chaos Spawn, Tzeentch deamon infused war machines like Defilers, and Tzangors could be other appropriate inclusions.

I like it! Has a lot more variety to it than rubricae but with echoes of the same poetic injustice of their story.

Wouldn't any marines not affected by the spell be little more than chaos spawn or some other matter of abomination by now anyway?

From.my understanding, the spell targetted the whole.chapter, it was only those with strong psykic ability who were able to withstand the power of the spell, the rest being turned into glorified dust-bins

It may also be helpful to point out that there have been a few cases where the affects of the rubricae have been reversed and the brother restored.

My theory is that the Flesh-change is the natural result of 1kSons geneseed mutating the host into a psyker. Aside from an infinitesimal demographic of nulls, humans are all fundamentally linked to the Warp. But only some humans are genetically predisposed to developing psychic powers. The process of becoming a 1kSon seems to expose the initiate's mind, and ultimately body, to the Warp beyond his natural genetic capacity. The normal proportion of 1kSons initiates are natural psykers (that is, a very low amount) ... but the "normal" initiatives (that is, by far the majority) would become "phony psykers" exposing themselves, by using their powers, to terrifying mutations.

So even if some 1kSons were somehow not subject to Ahriman's Rubric, they are very likely puddles of pink goo studded with eyes and tentacles ... unless they have completely forsworn using psychic powers ... and even then ...