However after his Legion's censure at [[Monarchia]], Kurtha Sedd's sanity began to slip. Shortly after this, his despair and rage drove him to massacre a group of pilgrims within a prayer hall. Remembering Lorgar's words, Kurtha became panicked that the Emperor had witnessed his shame and became certain that retribution would come. However retribution never came, and his Legion's officers covered up the incident. Having come to realize that the Emperor was not an omnipresent, divine being, Kurtha renounced his faith. He pledged to undo the works of the False-Emperor just as his Legion itself fell into the corruption of [[Chaos]]. His fanaticism led him to be selected by [[Kor Phaeron]] to lead a portion of the Word Bearers contingent against the Ultramarines in the [[Battle of Calth]]. Upon hearing that he would see his old friend Aethon again, this time as an enemy, Kurtha felt a twinge of regret but this was nothing compared to his burning hatred.{{Cite This}} Sedd commanded a warband of the [[Unburdened]] that overran an underground Ultramarines stronghold commanded by [[Space Marine Captain|Captain]] [[Valgius]], after tracking [[Space Marine Sergeant|Sergeant]] [[Aeonid Thiel]] from the surface. Occupying the base, he began reshaping it as a space to conduct a ritual for summoning a [[daemon]] that would inhabit his body. However, at the moment of his planned "ascension," Thiel returned in disguise and managed to free Captain Valgius, and together they killed the Dark Apostle.{{Fn|2}}

*{{Endn|1}}: [[Betrayal at Calth]] Rulebook , pg.45*{{Endn|2}}: [[Censure (Audio Drama)]] by [[Nick Kyme]]