In the Manga while fighting Raika, Ruby shows her ultimate magic: the Iron Maiden. Her talisman wrap around her and makes wings and arms that can elongate and magnify the damage of her hits. However, it isn't without repercussions because as she moves, the technique tightens around her, damaging her own body as well.
Seraphic Feather: After binding an enemy with the Iron Maiden, Ruby will then extend the feathers of one of her pair(s) of wings towards a target. The full power of this technique isn't known, though, they were able to pierce Raika when he was in his true form.