From Lexicanum

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The Horus Heresy is the name used for a time periode as well as a series of novels in the Warhammer 40,000 universe:

• Horus Heresy, a time period in the Warhammer 40,000 universe.
• Horus Heresy Series, a series of novels taking place during the Horus Heresy time periode.
• Horus Heresy Artbooks, a series of illustrated background books.
• Horus Heresy Board Game