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The Quarry - The Loop
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You see Ghulosh' Deathgaze.
Notes
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Part of The Secret Library Quest.
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Damage Taken From Elements
Physical 

Death 

Holy 

Ice 

Fire 

Energy 

Earth 

Location
Ghulosh's room inside the Secret Library.
Behaviour
It attacks from distance and moves very slowly.
Strategy
Always use Drown Damage protection during the fight against it. Have a Knight Challenge it and then position it against a wall, but do not trap it or it will teleport to the center of the room. Then, lure the Concentrated Death in front of it so it damages itself with its Death Beam.