 Fulgrim is delivered a warning about Horus' imminent betrayal and the disaster that may follow by the alien Eldar race, but he and his staff dismiss it.The Emperor's Children eventually become the "Chosen" of Slaanesh, one of the four Gods of Chaos, with which Fulgrim is slowly and unwittingly drawn into grotesque communion.Primarch Ferrus Manus and his "Iron Hands" Space Marines (the 10th Legion) also play a prominent role in the novel as Fulgrim attempts to lure them into betrayal, and several other Primarchs and Legions make appearances.