In an ancient magical struggle, the dread spheres were created to perpetuate undead forces for all time. Although the spheres' creators lost this conflict, a few dozen of these undead abominations remain to terrorize the living everywhere. Dread spheres float from continent to continent and from world to world, creating all manner and number of undead in their circuitous wake. When the undead it creates eventually slay it (see below), the sphere simply regenerates to begin the process anew.