Editing Mephiston (section)

===Divinatus Prime===
In ''Mephiston: Blood of Sanguinius'' it was revealed that while Mephiston had been "cured" of the Black Rage, whenever he tried to unleash his full might he would be overcome by a bout of UNSTOPPABLE RAGE (seriously, he conjured miniature Warp Storms several times in this book). Furthermore, his body was slowly changing (his skin turned darker, his RAGE became harder and harder to stop, etc.).

Mephiston sought the Blade Petrific, a Xenos artifact which could amplify its user's psychic power, as an answer to his problem (don't have to unleash full power if you can amplify less). The Blade was housed on the shrine world of Divinatus Prime, which had been lost to the Astronomican (Mephiston and his retinue had to jump, and traverse the Immaterium blind). Two Chaos Sorcerers, vying to be the protege of a third one, decided to make a little contest: Both of them would try to manipulate Divinatus Prime's populations to wage a civil war to see who would get the blade first.

Unfortunately, in the end, one of them escaped with the blade. [[Just as planned]], Mephiston deliberately let her to lead him to the third Chaos Sorcerer (whose identity he was implied to know.) Mephiston also realized that there was no salvation for him (his body had almost completely changed), but he said he "would be the Blood Angels' hope.". This also shows his deep loyalty. Rather than take the blade to save himself, he sacrificed his possible chance simply for a lead to a threat against humanity so he could destroy it.