You see a neutral deepling warrior
Notes
They are part of The Secret Library Quest.
Abilities
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Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Location
Brokul's room.
Behaviour
It will also attack Brokul, so use that in your favor. A neutral deepling warrior will retreat at 1 to 63 (0.06% - 3.94%, deep red) health.
Strategy
Try to get it to target Brokul instead of you.