The Abyssal Edge is a short story published in The Primarchs series that was originally part of an anthology. The Abyssal Edge was first published as part of the Sons of the Emperor anthology in February 2018. The cover image used is that of Sons of the Emperor, as The Abyssal Edge has yet to be published separately.
When an archivist uncovers an unthinkable truth, he comes to the attention of the First Captain of the Night Lords, the dreaded "Prince of Crows" himself. Terrified yet enrapt, Ulatal listens as Sevatar tells him of Zoah and the moment when Konrad Curze and Magnus the Red almost went to war...
- Sons of the Emperor (Anthology), "The Abyssal Edge" (Short Story) by Aaron Dembski-Bowden