The official source for the 54-book novel series, starting with Horus Rising Lexicanum/40k Lore Reddit:
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The Horus Heresy series spans numerous novels, short stories, and anthologies. At its core, it tells the tale of the Warmaster Horus, once the most trusted friend and ally of the Emperor of Mankind, who gradually becomes disillusioned with the Imperium and ultimately turns against his master. The series explores themes of loyalty, betrayal, corruption, and the very nature of good and evil. The official source for the 54-book novel series,