Book 25: Mark of Calth
A Horus Heresy anthology
The Heresy came to Calth without warning. In just a few hours of betrayal and bloodshed, the proud warriors of the XIII Legion – Guilliman’s own Ultramarines – were laid low by the treachery of their erstwhile brothers of the XVII.
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Some of Black Library's best loved authors tell dark and twisted tales from the battles in the caverns beneath Calth and continue plot threads from Know No Fear. David Annandale summons daemons, Rob Sanders gets into the heart of the darkness and Graham McNeill continues the story of Remus Ventanus, the Saviour of Calth.