Veritas Ferrum is the eleventh audio drama for the Horus Heresy Series that was not originally released as part of an anthology or other release. Veritas Ferrum was published online in December 2012 as part of the Black Library's Advent Calendar 2012, on the 24th day. The audio drama was later republished in prose format as part of the Legacies of Betrayal main series anthology novel. This audio drama, along with several others were also released as part of the Echoes of Ruin audio anthology.
When Horus' treachery was declared, the Iron Hands Primarch Ferrus Manus sped to the Isstvan System with his elite forces to confront the Traitors...and fell into their trap, losing the battle and his life. The X Legion warship Veritas Ferrum arrives in the Isstvan System as part of the second wave of Imperial forces. Battered by the foes and forced to retreat, the crew must make a difficult choice when survivors of the Drop Site Massacre ask for aid. Has the nascent war already started to claim the humanity of those involved?
- Veritas Ferrum (Audio Drama) by David Annandale