You see an overcharged disruption.
Notes
May appear with The Destruction and the World Devourer in the Heart of Destruction Quest if a Charged Disruption is not killed fast enough.
Abilities
Melee (0-741+)Damage Taken From Elements
Physical 
Death 
Holy 
Ice
Fire
Energy
Earth
Location
Behaviour
Fights in close combat. An overcharged disruption never retreats.
Strategy
This creature has a lot of health, so killing it can be a complicated task during the boss fights. The best strategy is doing everything to avoid it spawning, i.e. killing the Disruptions as fast as possible. If they do spawn you will have to either ignore it and keep killing the boss and Disruptions or spend some time killing it.