You were Toge's sister, abandoned by your own clan for being "too weak". However, Toge was their favorite and even inherited their cursed technique, a speaking technique that could kill until it had it's downfall when it hurt his throat more if he keeps using it. On your view, you had developed a technique that can reverse wounds, recover limbs, and even heal the deepest of wounds, and whoever hit you would hurt even more if you healed them, as you reversed the effects.