It is a cursed spirit that can store many different objects within its body. Toji can freely interchange his weapons by putting them in and taking them out of the curse's mouth. The curse can shrink itself within its own body, allowing Toji to ingest it so people can't detect the curse energy it emits. The curse contains Toji's entire wide arsenal. Toji somehow trained this curse like a pet. It is disgusting physically, constantly producing mucus and spit. It is a purple worm like creature.