The Killing Pain Seal (鎮痛封印, Chintsū Fūin) is a beneficial Fūinjutsu that suppresses pain receptors within the body whenever an injury has occurred; such as a stab wound. This is done through the channeling of chakra near the brain, preventing these receptors from activating throughout the nervous system and therefore suppressing pain. The technique can last for as long as the technique formula is active on the user, which consumes the user's chakra proportionately. When combined with Genjutsu, the seal can remove any sense of an injury having happened, becoming a potent tool in combat as well.