This allows you to change the “shape” and “color” of a rune, which will dictate their placement in the character slots. Transformation also costs Gold and enhance stones, with the amount depending on the rune’s grade. The resulting rune is totally random so you may need to perform multiple transformations (depending on your luck) to get the shape and color you wanted. You’ll have to do transformations if you want to activate set bonuses on a specific character.