Rainbow Fragments are a material found in Atelier Meruru: The Apprentice of Arland. It is a rare high quality ore material that is found late game. They are found in very few locations including the Arls National Mine (once fully developed), the Modis Ruins, Farthest Garden and Endless Corridor. It is used to make Regentium, which is required for the best weapons in the game. The 'rainbow power' trait will imbue weapons with the power to do elemental damage. Mimi also requires a Rainbow Fragment as part of her in game ending. Rainbow Fragment is needed for the following recipes: