Seikouki (神聖なエネルギー, lit. Sacred Energy) is a special kind of chakra form that only Rikudou Sennin ever fully mastered in all his years of seclusion, and belongs solely to those who have mastered the Rinnegan's final secret. It is special type of energy that is said to be the purest and most-powerful kind, which Hikaru calls the "highest echelon of power." Also known as "the cold-blooded will of fire" by ancient Konoha scrolls, certain powerful shinobi are able to generate and manipulate this energy. Mentally, it involves a complete absence of emotion or peace of mind, and physically it requires separating the energies of yin and yang. When the forces collide, the user only guides, rather than controls, the energy's direction. Because of this complexity, this attack takes much longer to ini