Fulgrim’s desire for perfection in all things left his mind open to doubt – the seeds of which were nurtured by the malevolent spirit that inhabited the Blade of the Laer and his own hubris. Following his apotheosis to daemonhood in the ancient xenos citadel deep beneath the crone world of Lydris, Fulgrim is able to shift his appearance between a more humanoid guise and a monstrous form gifted by his new patron deity.