I have an idea for a story. it goes like this Trixie was trying to absorb Celestia´s magic, while Celestia tried to do the same to avoid Trixie dooming the world, accidentaly, the alicorn amulet reacted due to the magic overload, a blind flash happened, and end it up fused together.Trixie is now happy that she has alicorn magic and want to rule everything.