Yogengan

The Tengoku Byakugan is a powerful  of the Hyūga Clan. It is an advanced form of the Byakugan that currently only Hisashi Hyūga has awkwaned.

Overview
Hisashi awakened it due to his unique bloodlines. It is considered to be the stage inbetween the Byakugan and the Tenseigan. It looks rather different from the regular Byakugan, as the pupiless white eyes become a light shade of blue, a black pupil appears, and it enlargens greatly. It does not have any specific set of requirements in order to be awakened, other than possessing both the Byakugan and the chakra of a Kaguya Clan member.

The Tengoku Byakugan possess the same abilities that the standard Byakugan does, however, it's to a much greater extent. It grants new powerful abilities and each eye may contain the same or a different ability. Once the power of both eyes is unlocked, their power can be combined to unleash the true power of the Tengoku Byakugan. Hisashi possess Jinsei Nagare in his right eye, Seika Nagare in his left eye, and with both eyes he can use Tengoku Nagare.