User blog comment:Imouto-tan/Deyanira/@comment-4867780-20161217035100/@comment-26362471-20161219192009

Indeed her personalities helped her stay relatively sane while being trapped there, they also helped her train her body and magic to be in top condition once she was out. As a Sherria, Deyanira's multiple personalities replace the need for Memory Vessels and having various combat magics and styles.

Yes, she was born a reincarnation of a Celestial Beast but no one knew this not even Deyanira herself. But by fusing another Imoogi it made her go insane even more and increased her inner darkness.

Deyanira was weakened by the inter-dimensional prison as it was made to imprison Huozai (which it did thousands of years later). Shiro was then original wielder of the Ultimate Nemesis.