Vallheim was one of The Four Lords to destroy The Undeath and bring life to Eden. He was also the leader of The Four Lords, and considered the most powerful of the four. At the dawn of the Age of The Four Lords, he, along with Loratiel, Iraam, and Orcir, challenged The Undeath for dominion over Eden. They amassed an army, and successfully destroyed The Undeath's reign over the world.
Vallheim was responsible for discovering the True Soul, and with it, bringing life to Eden, and allowing for the creation of Angels and Demons, by Loratiel and Iraam respectively, and eventually the creation of Humans by Orcir.