Blood Oath's Seal

"Even the slightest use of our powers would cause the heaven and earth of the three worlds to tremble. Because of that, we linked our lives to one another to seal away our true swords. And now, in exchange for three of our lives, the Blood Oath's Seal has been broken..." — Senjumaru Shutara in "Black"

Blood Oath's Seal
Kanji	血盟の封印
Item Statistics
Use	To restrict the Royal Guard's power.
Used By	Royal Guard

The Blood Oath's Seal (血盟の封印, Ketsumei no Fūin) is a special blood pact that prevents Royal Guard members from using the full power of their swords, by linking their lives together.

Overview

Kirinji, Hikifune, and Nimaiya end their lives to allow Senjumaru to unleash her true power.

Because each individual member of the Royal Guard possesses vast levels of Reiryoku, they can destabilize the three worlds by themselves should they unleash it all without restraint. Therefore, Kirio Hikifune, Senjumaru Shutara, Tenjirō Kirinji, and Ōetsu Nimaiya normally use each other's lives as seals to prevent their true power from being released; this also prevents them from being able to use their Bankai. To unlock this seal, three of the members have to take their own lives in order to enable the lone survivor to use their full power.

Trivia

• For reasons unknown, Ichibē Hyōsube is the only member of the Royal Guard exempt from this pact, shown to be able to activate his Bankai at will with no preparations.