Athame is a short story published in The Horus Heresy series that was originally part of an anthology. Athame was first published as part of the Mark of Calth main series anthology in April 2013. The cover image used is that of Mark of Calth, as Athame has yet to be published separately. Athame is a prequel to the events of Book 19, Know No Fear.
- Athame (Short Story) by John French