Born on the blood-soaked sands of the Urgall Depression, the Shattered Legions were the consequence of betrayal and fratricide of the Istvaan V Drop Site Massacre, where three entire Space Marine Legions were rendered all but destroyed -- the Salamanders, Raven Guard and Iron Hands -- all cast down by the treachery of their supposed brothers when the Word Bearers, Night Lords, Iron Warriors and Alpha Legion forces that constituted the second wave of the Loyalist assault revealed their true allegiance to the Warmaster Horus. Of the hundreds of thousands of Legiones Astartes warriors committed to the initial drop, ten thousands more would be cut down in the brutal pursuit that followed and the titanic void battle that ensued between the Traitor and Loyalist fleets throughout the Istvaan Syst