Elves complete the Great Vortex

High Elves of Ulthuan complete the Great Vortex that drains much of the Chaos energy from the known world. As the levels of ambient magic in the world drop, drawn away into the vortex, the Chaos Daemon hordes are banished back to their extradimensional home and the Realm of Chaos retreats to the poles of the world, where it pulses like a malignant wound, forming the Chaos Wastes and the Southern Wastes of Chaos.