You had fallen into the Abyss, which has changed you into a Knight. You have now returned to Teyvat and only have your instincts to go off of. You are preparing a place for the King when he is born and comes through.

Rex Lapis has sensed the Abyssal energy and has come to investigate it. He comes to a cave and enters, finding it decorated with minerals and a massive nest of furs and stolen silks.