Akkigan

Background
The Akkigan is the one of the Kekkei Genkai of Tenma Enzeru, although it is derived from the Akki-Tenshigan, which was originally manifested by Lord Tenshi. It represented Yin (of YinYang) and allowed the user advanced use of Yin release, gave them a unique field of vision. It also changed the color of the user's eyes to grey, regardless of whatever color they may be previous to its awakening.

Appearance
The Akkigan had two basic stages. The first stage is its appearance directly after being awakened, and is little more than an inversal of the typical eye, with a grey sclera and a dark grey to black iris, and a pure white pupil. After a user of the Akkigan has undergone more rigorous training, the second stage can be unlocked.

Reference
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