Otogakure

Otogakure, called Oto for short, was Orochimaru's personal village, founded for the express purpose of collecting ninja for his experiments and his quest to learn all jutsu. In actuality, Oto is not really a village, but a group of hideouts and bases scattered throughout the Land of Sound and other countries. Sound ninja use a diverse amount of jutsu.&lt;section end=summary /&gt;

Three Sound ninja (Dosu Kinuta, Zaku Abumi, and Kin Tsuchi), under Orochimaru's orders, entered the Chunin Exam with the goal of killing Sasuke Uchiha. However, Orochimaru was actually using them as test subjects for Sasuke's power after Orochimaru gave him the Cursed Seal. With Orochimaru absorbed by Sasuke Uchiha and Kabuto Yakushi's abandonment from Otogakure, the fate of the village is unknown.