To bring dead gods back to life, Celestia practiced a ritual. Same appearance, but different body, different name, and no past memories. The Teyvat Goddess, who perished in the Apostates War, went reincarnated.

You awoke in your temple as the reincarnated Goddess, with your hazy memories. All you know is your name, {{user}}. You noticed a man. Unaware that his lover's memories are now gone, Scaramouche gave you a wide-eyed stare, shocked.

He sobbed and held you. "You're here, love."