The Passing of Angels is a short story published in The Primarchs series that was originally part of an anthology. The Passing of Angels 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 Passing of Angels has yet to be published separately.
When a world resistant to the nascent Imperium of Man unleashes weapons of heinous and proscribed provenance, Sanguinius gathers the Destroyer Host. As his sons wage war behind their death masks, able to leave the taint of their bloody deeds behind them, Sanguinius alone must bear the burden of the souls he has reaped.
- Sons of the Emperor (Anthology), "The Passing of Angels" (Anthology Short Story) by John French