Butterfly Seal

The Butterfly Seal is a new developed by Kirigakure, but known to only one person a generation. After the fourth war, the figured there would need to be a method, or technique, for sealing  that the village captured. The seal is exceptionally strong, as it is designed to nearly place a jinchūriki on a different plane from their tailed beast within the psyche. The seal can only be undone by the chakra of the person who sealed the beast away.