Relive the events of Isstvan III!

"Lock and load!"
– Captain Garviel Loken

Flashback event! The Warmaster put in motion his plot to rebel against the Imperium on Isstvan III, where four entire Legions fought to cleanse their ranks of those who remained loyal to the Imperium.

Fight with the soon-to-be rotating out Warlords, and battle on the surface of the planet where the Horus Heresy began. Will you fight alongside the noble Loken, Garro and Tarvitz, or carry out the Warmaster's will with Abaddon, Durak Rask, or Fabius Bile?