The Reincarnation Sphere is a precious, spherical jewel that is central to the story of Senran Kagura 2: Deep Crimson. It is guarded and overseen by the Goshin Clan, and is the resting place of Kagura.
The Reincarnation Sphere is the artifact through which Kagura is reborn every 100 years after after smiting Yoma. When Kagura's deed is done, her body crumbles, she returns to the sphere and slumbers for another 100 years.
When Kagura's reincarnation draws near, a priestess is appointed to watch over her and help her see her mission through.
The jewel is completely opaque, meaning it cannot be seen through. It bears the emblem of the Goshin Clan.