You see a deathslicer
Notes
Deathslicers are immune to all known damage types that players can attack with. However, if someone manages to kill one of them, it will respawn immediately after dieing. Note that they are pushable.
Abilities
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Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Location
Deep in Tarpit Tomb, Formorgar Mines during Ghazbaran's raid.
Behaviour
Deathslicers will get as close as possible to you, attacking with its strong Melee and heavy Energy-Based Spells. A deathslicer will retreat at 20 (0.24%, deep red) health.
Strategy
Use a stronger monster such as a Demon to destroy it, when it's trapped. You can push it.