The Kingdom of Magnus was a nation that existed prior to the Great Upheaval, in the World Before. It was established by Magnus, known as the Lawgiver, he united many of the ancient tribes under his rule and created a code of laws that allowed the different races to coexist peacefully.
While many species claim that Magnus was of their bloodline, his actual species is unknown.
The center of power of Magnus' kingdom was the city of Asgard, the ruins of which are still located on Earthbreach.