On the nineteenth day of Black Library’s 2016 Advent Calendar, James Swallow’s short story Exocytosis oozes onto our e-readers, the penultimate Horus Heresy story in the collection. Amidst the forests of Zaramund, Luther and his Dark Angels offer aid to the battered forces of First Captain Calas Typhon, but there’s little trust between the Angels and the Death Guard. Plagued by unsettled, troubled thoughts and unsure what to make of the slow changes coming over his body, Typhon waits while repairs are made, whiling the time away in restless contemplation. Meanwhile the Dark Angels watch and listen, making their own plans.
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