Yin Seal: Release

Shadow Seal: Release

 * Name: Infūin: Kai, 蔭封印・解, literally "Shadow Seal: Release" English "Reserve Seal: Release"
 * Type: S-rank, Supplementary
 * Users: Tsunade

This jutsu releases the massive amounts of chakra stored inside the seal on Tsunade's forehead. She then may use this chakra for many things like for her Creation Rebirth, a powerful regeneration technique.