Late Empire of Man
The Late Empire of Man spanned the entirety of the known world, and achieved technological wonders. It was inhabited entirely by Mannish Races. It is thought that the Fey were once a part of the Late Empire long before its collapse, but that they were hunted to extinction, only to re-enter the world during the The Fire.
What caused the collapse is unknown, but the Late Empire left behind many technological wonders and strange magics, such as the Incarcerate, the Rock, and the Hammer of Ivan.