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Void terror

From WoWWiki

See Combat [67-68] Void Terror for the specific mob.
Void terror

A void terror is a huge and extremely powerful two-headed demon. This beast possess a nearly unlimited source of demonic energy. The only known void terror residing in Azeroth is Immol'thar found within Dire Maul in Kalimdor. A large number of them have been sighted in Outland, guarding certain regions of the Blade's Edge Mountains and prowling the Netherstorm.

Named void terrors