You see a voidshard.
Notes
It looks the same as a Breach Brood.
Abilities
Melee (0-300+)
Energy Beam (300-450?)Damage Taken From Elements
Physical 
Death 
Holy
Ice
Fire
Energy
Earth
Drown
Location
The Orc Cult boss room under the Edron Orc Cave.
Behaviour
It fights in close combat.
Strategy
Unknown