Flesh and Rot
It has been two centuries. Two centuries since the fall of the Helixian Kingdoms, who end came through demons, corruption, evil and the dead. For once such a flesh wound is made against a kingdom it does not take long for it to rot.
There had always been war and battle between the west and the east, and it was in a final blow that the eastern empire unleashed a plague of chaos on the Kingdoms of the West, a great many tragedies occurring in the space of a year was all that it took to bring the kingdoms to the ground.
Since somethings have re-built, some cities do exist, but the dead beneath are feet still live, and soon the plague of chaos will return.