Grandfather's Gift - A Mortarion Short Story is the sixty-second short story published in the The Horus Heresy series that was not originally part of an anthology novel. Duty Waits was first published on day 4 of the Black Library's 2017 Advent Calendar.
When Mortarion, Daemon Primarch of the Death Guard Traitor Legion, awakes in a strange garden with no memory of who he is, he cannot know what delights await him in its rotting tranquility. Above all things, Papa Nurgle is a generous god.
- Grandfather's Gift - A Mortarion Short Story (Short Story) by Guy Haley