Ningyō-yose atsume: Regen

The user is able to override Merry's freewill and force her to heal, tapping into the chakra at her core and flooding it throughout her body to rapidly repair wounds. Although this technique is able to be done by Merry when she wishes, it is used most often to give the opponents a sense of despair as it renders Merry nearly indestructible, as her entire body must be destroyed in the same instant for it to be made impossible for her to regenerate. The greater the wound inflicted upon Merry, the longer it will take to heal. Meaning that if she was completely destroyed with the exception of a hand, it would take her exponentially longer to regenerate that it would if she had a deep slash to her side. This technique does not require the user to use any chakra since their will is able to easily be imposed over Merry's own and the chakra used comes from Merry's body, but the user may choose to expel chakra in order to speed up the healing process.