First Lord of the Imperium is the second audio drama for The Horus Heresy - Primarchs series. First Lord of the Imperium was released as an MP3 format as part of the Black Library's 2017 Advent Calendar, on day 14.
As the Horus Heresy rages and the death toll rises, one more will be added to the numberless dead: Sibel Niasta, personal Astropath to the First Lord of the Imperium, Malcador the Sigillite. As her end approaches, Malcador sits vigil by her bedside, and the pair discuss their friendship and what it means -- how the past and present have shaped Malcador and the Imperium, and what the future holds.
- First Lord of the Imperium (Audio Drama) by Laurie Goulding