Highlord Kruul

Highlord Kruul is the Field Commander of the Burning Legion in Azeroth and a villain in the Warcraft universe.

After Kazzak reopened the Dark Portal, he sent Kruul to invade various locations including Alliance and Horde citites. Kruul led several of troops into battle from Outland. A group of adventurers later killed Kruul and his men afterwards and entered Outland through the Dark Portal.

Trivia
Kazzak was the field commander before Kruul.