You see aggressive matter.
Notes
It looks the same as a Rot Elemental. They spawn when you kill an Organic Matter.
Abilities
Poison Berserk (400-800)Damage Taken From Elements
Physical 
Death 
Holy 
Ice
Fire
Energy
Earth
Drown
Location
Warzone 4 inside the boss room.
Behaviour
They fight in close combat.
Strategy
Kill them as fast as possible because they make boss stronger. With too many around boss fight become harder.