Taken from Gods Eater Burst's database:
A fallen Ouroboros, whose outer structure has undergone change. Able to unleash attacks the standard Ouroboros can only access when enraged. Extremely small in number, its habits are unknown.
Placing it in Bind Mode will allow you to seal its powerful attacks, such as Mowdown and Wide-ranging Flashbomb. In particular, it loses resistance to Bind Mode when activated by rage, so try to take advantage.