Honour to the Dead is the thirteenth audio drama for the Horus Heresy Series that was not originally released as part of an anthology or other release. Honour to the Dead was published online in May of 2013 by the Black Library as an audio CD. The audio drama was later republished in prose format as an e-book and later as an enhanced audio book. Honour to the Dead was also published as part of the Legacies of Betrayal main series anthology novel.
As Calth burns, the Battle Titans of the Fire Masters Titan Legion take to the streets of the city of Ithraca, ready to massacre the fleeing civilian population in the name of their new, dark masters. But the remaining Loyalist engines of the Legio Praesagius -- the "True Messengers" -- still stand ready to defend the Imperium, even in the face of almost certain death. With the nearby Ultramarines forces scattered and lost, the people of Ithraca must fend for themselves as gigantic war machines unleash apocalyptic weaponry across the ravaged skyline...
- Honour to the Dead (Audio Drama) by Gav Thorpe