Genshin Impact: The Sun Demon God, Beginning with the Reincarnated Scarlet King

A wild original-character fanfic inspired by Genshin lore, with multiple female leads and Phanes as the main female lead. The protagonist was once the All-Devouring Narwhal. Before dying, it devoured the Blue Star. And then... Teyvat is, in truth, a place of endless cycles created by the gods. The planet was born to face a calamity, and will ultimately die in preparation for it. That calamity is called the Cosmic Cataclysm. The world was transformed from a star-devouring beast. This tiny planet has become the last surviving cradle of civilization in the universe, but survival comes at a price. Did the Descenders bring humanity to the planet to protect them, or to choose the child who would face the calamity? The one who transcended the world borrowed the All-Devouring Narwhal's power and ventured into the cosmos. By the time they returned, they had become the embodiment of catastrophe... But the world was already nurturing something. Would it hatch from an egg, or become a pearl inside a clam? It all begins with a tiny grain of sand reborn as the King of Red Sands. My name is Shaji. I am an immortal and indestructible demon god, imprisoned in Teyvat. I was born of the world, and my bond with it is closer than anyone's. It is as though I am the world, and the world is me... The Abyss is me... Phlogiston is me... Wilderness and Ousia are me, too... I am the first demon god... And also the first human... The Record of Primordial Creation