A Horus Heresy novel

The Battle for Calth is over, and the Underworld War has begun. Steloc Aethon and his Ultramarine brothers battle the treacherous Word Bearers in the darkness, but will they be consumed by vengeance?

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See the Ultramarines from the new boxed game 'The Horus Heresy: Betrayal at Calth' brought to life as the destruction of Calth forces them into desperate battle in the Underworld war. The undisputed hero is a Terminator sergeant who wades through liquid coolant and forces himself to his very limits to defeat the foe...