You see a shard of Magnor.
Notes
It's part of the final battle of the Grave Danger Quest.
Abilities
Melee (0-1000)
?Damage Taken From Elements
Physical 
Death 
Holy
Ice
Fire
Energy
Earth
Drown
Location
Behaviour
A shard of Magnor attacks in melee range. A shard of Magnor never retreats.
Strategy
Defeating Magnor isn't very complicated and the players should just attack it, specially with Fire Damage. When it dies, 4 Shards of Magnor will spawn, sharing the same health pool. They die rather quickly, but care must be taken since when dying they explode dealing high Life Drain damage. To mitigate the damage taken by the blockers, they can split the Shards between then and block them far away from each other. Shooters should also stay far from the boss to avoid this damage