Zaboul

Zaboul, Lord of Wrath is/was a demon who was active prior to the Dark Exile. When the Prime Evils declared that they would not invade Sanctuary, he forged the Burst of Wrath. A thousand demons died in the process.

Trivia

 * A "Lord of Wrath" skin exists for Imperius in Heroes of the Storm. It is dubious as to whether the depiction is meant to represent Zaboul however, as the skin is labelled as "demonic Imperius," and retains angelic wings.