 The temple is the seat of a powerful Chaos cult, and both Horus' wound and its supposed healing makes him susceptible to Chaos' influence.He ultimately turns against his "father", the Emperor, and sets in motion the entire Heresy.This novel further highlights the institutional and personal tensions that accompany the Imperium's maturity into the preeminent power of the galaxy; they include rifts among the Primarchs, as well as both between and within their Space Marine Legions.