The Curse Technique: Black Snake is a jujutsu that is applied to every Hyōga Wire Box in order to prevent them from falling into enemy hands. If the box is opened incorrectly, the contents of the box will liquefy into a poisonous, black, ink-like liquid. Next, three snakes made from this liquid will emerge and bite anybody nearby. This bite is paralytic and eventually causes the victim's insides to liquefy into a grey-colored sludge.