|Manga Debut||Chapter 373|
Uroboros (ウロボロス, Uroborosu) is an illusion Viper utilizes, of which he unleashes multiple large and blind eel-like creatures with large mouths and sharp teeth at a target. Viper declares it to be his strongest illusion.
- 'Uroboros' is most likely a translating error, as the correct terminology should be 'Ouroboros' (or alternatively, 'Uroborus'.) Ouroborus comes from the Greek language: οὐρά (oura) meaning "tail" and βόρος (boros) meaning "eating", thus "he who eats the tail", which mirrors Viper's animal partner Fantasma, that bites its own tail.