[Evolution]+[Dungeon]+[Magic]+[Non-Human]+[Single Female Protagonist]+[System]+[Upgrade] Accidentally traveled through the magical world, and was turned into a tattered skeleton on the first day. Upgrade, evolve, Add attribute points to transform from a low-level skeleton that breaks at a touch, to a hard skeleton, and then fuse with the horns of the bone dragon to evolve into an elemental skeleton. Upgrade step by step, fuse, evolve, and grow until you become the strongest skeleton, starting from a low-level skeleton.