Arc 10Sage Mode and the Kusanagi Sword
Uya killed Uchiha Kageyama after the Uchiha Clan targeted him, then traded Uchiha Rin’s Mangekyō Sharingan to Orochimaru for research and pursued his own Sage Mode. After claiming Bloody Hand’s Totsuka Blade and forging it with his other swords into a powerful new Kusanagi Sword, Uya headed toward Mount Myōboku.
- Uya agreed to help Orochimaru twice in exchange for a soul-strengthening technique and the Added-Weight Rock Technique, then mastered the technique while Uchiha Kageyama arranged for Uchiha Rin to assassinate him.
- Uya defeated Uchiha Rin’s light-based Mangekyō illusions and killed him, then took his eyes and decided to prepare before confronting the Uchiha Clan.
- Uya killed Uchiha Kageyama at Fugaku’s succession ceremony, overcame his Izanagi and Amaterasu, and challenged Hiruzen over whether he knew of Rin’s assassination attempt.
- Uya gave Orochimaru Rin’s Mangekyō Sharingan in exchange for soul-strengthening research and a Ryūchi Cave Sage Mode scroll, then studied senjutsu and visited Katsuyu in Shikkotsu Forest for another training method.
- Uya pursued Bloody Hand for the Totsuka Blade, defeated him, and sealed him inside the gourd before the blade absorbed his other two Kusanagi Swords and began forging a replacement.
- Uya learned to sense and influence natural energy, developed his own Sage Mode, and began using it to strengthen his body and pursue opening the Sixth Gate.
- The Totsuka Blade exploded after completing its fusion, leaving Uya with a golden Kusanagi Sword that could change forms and amplify his tremor power enough to devastate the surrounding mountains.
- Uya turned toward Mount Myōboku after sensing the mountain range’s unusually dense natural energy.