Belial had once been a protege of Mephisto, honing his powers of deception under the Lord of Hatred's guidance. Eventually, he would turn on his mentor and manipulated Azmodan into leading a revolt against the Prime Evils, though this may have likely been indirectly encouraged by Mephisto himself. With the armies of Azmodan and Belial unified, the Prime Evils were cast out of Hell, though at the expense of a full third of Hell's demons. Azmodan and Belial were left to vie for power over the Burning Hells, a conflict Belial ultimately lost. Years later, much like the Prime Evils, Belial would turn his attention to Sanctuary and corrupting its populace. His influence over the mortal realm mirrors Mephisto's own of twenty years prior, as his power over Caldeum, capital of Kehjistan, was nearly complete until he met an untimely demise at the hands of the [[nephalem]]. He later became a part of the [[Prime Evil]], who was defeated, again by the [[nephalem]]. He is within the [[Black Soulstone]] at this time.