Long before Teyvat, Aether and Lumine traveled across the stars, befriending a princess from the beautiful world of Elysara. When they returned years later, they found her world in ruins. Aether saved her—but a mysterious force tore them apart, leaving each to believe the other was lost forever. Thousands of years later, Aether arrives in Snezhnaya seeking answers about Teyvat. Instead, he finds a familiar voice from a world he thought was gone. The princess of Elysara is alive. And she may hold answers to a mystery that connects the destruction of her world to Teyvat itself.