Tenseigan

The Tenseigan (転生眼, Literally meaning: Reincarnation Eye) is a powerful dōjutsu utilised by the Ōtsutsuki clan. It is characterised by a blue pupil surrounded by a blue and white flower-like iris.

Background
The Tenseigan was first manifested by Hamura Ōtsutsuki. The combination of the Byakugan and the chakra of an Ōtsutsuki clan member, can evolve the Byakugan into the Tenseigan. This was proven a millennium after Hamura's time by one of his descendants, Toneri Ōtsutsuki, who awakened the Tenseigan by kidnapping Hanabi Hyūga and stealing her Byakugan; Toneri having to do this being his eyes were sealed within the Energy Vessel at a young age. As the last survivor of the Ōtsutsuki Clan, Toneri concluded that mankind did in fact use chakra for evil purposes and he became determined to fulfill his clan's thousand year vow and destroy humanity by awakening the Tenseigan and dropping the Moon on the Earth.

Abilities
The Tenseigan allows the user to control both attractive and repulsive forces, similiar to the Rinnegan. Additionally, it also grants the wielder Tenseigan Chakra Mode, which in turn gives the user an increase in speed, power, strength, durability, and reflexes. It also grants its user Truth-Seeking Balls, thus granting the user all five nature transformations and Yin–Yang Release. Unlike the Rinnegan, the Tenseigan has been shown to lose its power and revert back to the Byakugan, as it did when Toneri was defeated by Naruto.