Tenseigan

The is a powerful dōjutsu utilised by the Hamura Ōtsutsuki and his descendants. 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 descended from Hamura 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; he having to do this due to his eyes being 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 fulfil 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, similar to the Rinnegan's Deva Path. 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.

The Tenseigan has been shown that it can lose its power and will revert to the Byakugan, as it did when Toneri was defeated by Naruto Uzumaki.