Up until August of 2001, history is precisely as we know it.
On August 10, 2001, what has come to be known as Realmfall occurred. At about 1:30pm in Scandinavia (2:30 in Greece, Finland, and Egypt), reality bent and altered in an instant, in a moment which both the mythos and scientifics described as gut-wrenching and highly disorienting, like a few seconds of being on LSD as the world jumbled and superimposed on itself.