The Storm of Chaos (2521-2522 IC) was the great Chaotic assault intended to conquer first Kislev and the Empire, and then the rest of the Old World, launched by the Forces of Chaos under the leadership of the Champion of Chaos Undivided, Archaon the Everchosen, also known as the "Lord of the End Times." The Storm of Chaos broke over the northern territories of Kislev and the Empire of Man in 2521 IC and was finally broken by a potent grand alliance of Men, High Elves and the Dwarfs at the Battle of Middenheim in 2522 IC.