Necro Overlord Mezhen is the Necromancer in charge of awakening the Vrykul at Gjalerborn. He can be found conducting a ritual on a captured prisoner. He fights with the regular shadow bolts.
He is a target for quests of Necro Overlord Mezhen for both the Alliance and the Horde. He does also drop Mezhen's Writings, which start the quest of The Slumbering King.
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The name may be a reference to Chris Metzen, Vice President of Creative Design at Blizzard.