All That Remains is a short story published in the Horus Heresy Series. All That Remains was originally published as part of the limited-release anthology novel The Imperial Truth, and it was later released as a stand-alone e-book. It is now also included in the War Without End anthology novel.
As Horus' rebellion consumes the galaxy, the dead number in the billions. Far greater, however, are the countless casualties evacuated from front line duties to tend their wounds and someday return to the fight. On one particular vessel cast adrift in the Warp, a handful of ragged Imperial Army soldiers make a startling discovery, and the question of why so many more of their comrades have been lost is soon answered...
- All That Remains (Short Story) by James Swallow