The Underworld War is a short story published in The Horus Heresy series that was originally part of an anthology. The Underworld War was first published as part of the Mark of Calth main series anthology in April 2013. The cover image used is that of Mark of Calth, as The Underworld War has yet to be published separately.


Seven standard years after the Battle of Calth, a war weary Vakrah Jal, Kaurtal, journeys to the blasted surface of Calth and remembers his rebirth at the hands of Argel Tal.


  • The Underworld War (Short Story) by Aaron Dembski-Bowden
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