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I have read a couple of the books pertaining to the events of Prospero but I don't think they give a number on how many guys were turned into Rubricae. I know a lot of the sorccerers were protected from it as well.

Why did the rite fail also? Was it something Ahriman did wrong or was it the intervention of Tzeentch to screw him over just for fun?

Well, IIRC there were about 1000 Legionaries who escaped Prospero. I generally assumed that around 10% were Sorcerers, who would have survived, but that's just a guess.

Also, the Rubric didn't fail at all. It accomplished exactly what it was intended to do, which is prevent the Thousand Sons from mutating. It just had unintended side effects.

 Gravewalker wrote:

Why did the rite fail also? Was it something Ahriman did wrong or was it the intervention of Tzeentch to screw him over just for fun?

Yes. Think of Tzeentch as an donkey-cave GM that gave his players a wish scroll.

"Choose your words carefully."

The Rubric technically didn't fail in its goal, but it did fail. It failed because it wasn't completed, Magnus intervened and stopped Ahriman before he could finish. We don't know what would have happened had Magnus not stepped in though.

Delicate Swarm wrote:Well, IIRC there were about 1000 Legionaries who escaped Prospero. I generally assumed that around 10% were Sorcerers, who would have survived, but that's just a guess.

Also, the Rubric didn't fail at all. It accomplished exactly what it was intended to do, which is prevent the Thousand Sons from mutating. It just had unintended side effects.

I believe those numbers have been changed in the hardcover versions of Thousand Sons to be 10,000, with the overall Legion numbers being 100,000.

Orblivion wrote:The Rubric technically didn't fail in its goal, but it did fail. It failed because it wasn't completed, Magnus intervened and stopped Ahriman before he could finish. We don't know what would have happened had Magnus not stepped in though.

Source on Magnus's intervention? Because in the Ahriman series, Ahriman himself believes he was at fault, and in Talon of Horus, Khayon believes it worked exactly as Tzeentch intended and I have to agree with him.

The book A Thousand Sons almost specifically states that the entire chapter strength is 9 companies each of about a thousand marines. That's right, we are led to believe there are less than 10,000 marines total of whom only 1000 survive to make it off planet. The only way I forsee this number changing is if the FW:HH novels give them more as these books are canon.

Even the super-small Salamanders legion had 80,000 marines at full strength.

~1000 were teleported from Prospero.
However there would have been others as well. The entire TS fleet was scattered, and we know at least partially made it to the planet of sorcerors (as the characters in Talon of Horus did)

So potentially another couple of thousand there. Plus any sons stationed elsewhered during the heresy.

I get the impression from Ahriman Exile that the rubric affected everything with the TS geneseed , not just the ones in the eye of terror ( if Somehow some sons didn't go there)


Either way, there are cripllingly few TS left.


Automatically Appended Next Post:
I believe that the Thousand Sons novel has been updated to reflect them as having proper legion strength. However the comparison of the survivors to the legion name still stands.

 Generalstoner wrote:
The book A Thousand Sons almost specifically states that the entire chapter strength is 9 companies each of about a thousand marines. That's right, we are led to believe there are less than 10,000 marines total of whom only 1000 survive to make it off planet. The only way I forsee this number changing is if the FW:HH novels give them more as these books are canon.

Even the super-small Salamanders legion had 80,000 marines at full strength.

The FW Horus Heresy books already have given them more by proxy, they say that after the battle of Gate 42, the Raven Guard were down to 80,000 marines, the smallest of any legion.

I believe in the Arhirman novel series it's revealed that either Magnus or a Lord of Change deliberately mislead Arhimon and gave him the wrong info that ultimately caused the Rubric to mess up.

There were TS outside Prospero by the time of the Space Wolves' attack. There's a short history of a small fleet returning to the planet after the attack.

Anywya, the TS/SW HH book will give us the final word on this debate