Segaki

Segaki is a kinjutsu developed partly by Orochimaru, and completed by Nigihayami, which is necessary for counteracting of the negative effects of the Chakra Signature Technique. It requires a complex ritual, in which the target, usually restrained in some manner, is stabbed through the chest with a sword, but in such a way that nothing except flesh is pierced, and then chakra is pulsed through the sword to kill them. Their chakra travels up the sword and into Nigihayami's left arm, where it replaces the myriad other chakra signatures. This is done once every so often, depending on how much the Chakra Signature Technique is used, in order to "cleanse" the arm of leftover signatures, so that Nigihayami is not overwhelmed.