Ironfire is the twenty-third short story published in the Horus Heresy Series that was not originally part of an anthology novel. Ironfire was first published within the event programme for the Horus Heresy Weekender 2015, and later released as an e-book. Ironfire is the sequel to the short story The Iron Within from the Age of Darkness anthology novel.
His body broken by the fall of the Schadenhold, the Iron Warriors Warsmith Idriss Krendl is nonetheless far from defeated. Now commanding two of the mighty siege guns stolen from the Forge World of Diamat, he seeks to redeem himself in the eyes of his Primarch by bringing down the Great Selenic Palace on Euphorus, and gather invaluable tactical data for the eventual assault on Terra. His plan? To utilise a strategy of his own devising -- the glorious Ironfire Protocol.
It is never once mentioned in Ironfire that the two mighty siege guns used by the Iron Warriors, the Eradicant and Obliteratus, are both Mechanicum Ordinatii, they are instead only refered to as massive siege guns.
- Ironfire (Short Story) by Rob Sanders