The Shadow Crusade was a joint military campaign conducted during the opening days of the Horus Heresy into the Realm of Ultramar by the Primarchs Lorgar Aurelian of the Word Bearers Legion and Angron of the World Eaters Legion. The two Traitor Legions proceeded to lay waste to the Ultramarines Legion's stellar empire in the Eastern Fringe of the galaxy, rapidly destroying twenty-six worlds in quick succession. This campaign ensured the success of the sorcerous Ruinstorm that had been conjured by the Word Bearers during the Battle of Calth, which would ultimately divide the galaxy in two, effectively cutting Ultramar off from the rest of the Imperium of Man. Ultimately, the Traitors' campaign proved successful, but it resulted in the death of the entire population of Angron's homeworld of