An unique form of sealing technique which passed down in Land of the Sky which used to seal (or restrain) Zero-Tails. It seems very complex sealing technique, caused by many preparations to do before (judged by many sealing formula or sigils carved in the sealing room and a huge tablet used to restrain the beast).
However, even restrained, Zero-Tails still able to use its abilities like manifested itself, sense negative emotions, possess anyone who is emotionally unstable, heart reading, and also to feed upon the darkness within one's heart and allows it to create enough dark chakra. This technique also permit the beast to absorb chakra from external sources.
It presumed this sealing technique seems designed to utilise the dark chakra generated by Zero-Tails rather than seal it.
