Jūgo Clan

This clan is an unknown family, which originated from an unknown area. The members of this clan possess the innate ability to absorb natural energy (自然エネルギー, shizen enerugī) from their surroundings due to their special bodies. As a result of this unique capability and constitution, clan members can undergo various drastic physical alterations. However, the adverse effects of this energy result in sudden and uncontrollable surges of power, causing them to sporadically go berserk.

According to Kabuto Yakushi, Orochimaru's subsequent investigations and experimentation allowed him to discover the origin of the clan's power at the Ryūchi Cave, where he and later Kabuto learned Sage Mode.