Heart of the Conqueror is the fifteenth short story published in the Horus Heresy that was not originally part of an anthology novel. Heart of the Conqueror was originally released as part of the programme for the Black Library Horus Heresy Weekender on May 17, 2014. It is also now included in the Legacies of Betrayal anthology novel, and is avalible as an audiobook (MP3).