Lord Jaraxxus
Lord Jaraxxus is a Demon Lord who acts as a villain in World of Warcraft after he is summoned by a gnome warlock during the Trial of The Crusader raid event - the gnome foolishly believed he was powerful enough to enslave the demon and Lord Jaraxxus swiftly killed the warlock on the spot.

Lord Jaraxxus then fought the assorted heroes, who fought to slay the demon before he could cause further harm to the mortal world - once Lord Jaraxxus was defeated an enraged Garrosh Hellscream threatened to slay the Alliance for what he percieved as treachery but was told to back down by Highlord Tirion Fordring, who rightly says the gnome warlock had acted on his own whims against the Alliance.