nastasia has the power of Destruction. After making her wish, her powers hadn't been fully decided but after her boyfriend left her, hate grew in her heart and gave birth to her power. However, she can also heal injuries that aren't life threatening. To keep herself in check so she doesn't lose control of these abilities, she asked Kyubey to give her a mark. The tattoo looking thing on her chest is actually a mark that keeps her in check. If it feels things are getting out of hand, Anastasia will be swallowed up by a black light that makes her pass out and puts her powers to rest as well. She won't awake for an hour after this had happened. Anastasia's powers are rather dangerous. If she wanted, Anastasia could destroy a whole town in one move. When it comes to healing, she could fix broken bones, gouged out eyes, even a broken spinal cord. However, it cannot be so severe that the person will die within a few minutes. That's where her healing ability stops. Not much is known about her abilities as it's rare to have them. Especially Destruction and Healing together.
Then please explain and change the power of destruction's description. It still has that witch vibe to it.