Mangekyo Rinne Sharingan

The jewel of the crown, the ultimate eye power that only the fused being who has obtained the Rinne Tenseigan can manifest as a third eye in the forehead. The first and only recorded user in history was the fused founder of the Otsutsuki clan who used the Divine Paths of the Sharingan to defeat and seal the Black Beast back into the void it has spawned from.

The Mangekyo Rinne Sharigan possesses every ability that can be manifested into a Mangekyo Sharingan. It can cast Amaterasu, Tsukuyomi, Kotoamatsukami, Kamui or any other Sharigan related ability the user deems necessary to win in battle.

It's ultimate powers however are Infinite Izanagi and Infinite Izanami. The first remakes reality into what the user desires it to be, the second traps all those who reject the new reality into a nightmare that only ends when the target acknowledges the new world as the real one.

Once the pair Infinite Izanagi and Infinite Izanami are cast, the fusion comes undone and the constituent parts remain the only one who remember how the old world was.

When the fusion is undone, it takes at least 10 years for the fused god to be recreated.

When the Mangekyo Rinne Sharingan is combined with both Rinne Tenseigans, it produces the True Susanoo if legend, the only warrior of chakra Strong enough to tackle the Black Beast back into the darkness is was summoned from.

OBS:
If the two soul fused warrior absorbs the Eight Headed and Eight Tailed Black Beast into Susanoo, it will become a 10 tailed black beast of unstoppable power. An Ultra Instinct fighter must be called to fight the damn thing or the multiverse is doomed.

Rinnegan vector done by me, Otsutsuki clan symbol copyied from (naruto.wikia.com/wiki/File:…).