You see an echo of Vemiath.
Notes
Appears in the Bakragore bossfight, replacing one of the Elder Bloodjaws in the fight, when 
The Essence of Vemiath is used to activate a stage of the Bakragore's Burden. When killed, it respawns as an Elder Bloodjaw.
Abilities
Charge Consuming Beam (triggers damage of all charges)|
Echo of Vemiath
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Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Drown
Location