Chiboshū

Chiboshū (血募集, "Blood Offering") is an advanced form of incantation invented by. It involves the infusion of the sorcerer's blood into a spell in order to strengthen and enhance its power beyond what the use of its standard verbal incantation will accomplish. While all but confirmed, it is said that the spell can be enhanced by nearly a factor of a hundredfold. Unbeknownst to all but Kamui himself, its creator, the inspiration for this concept was ironically based upon teachings.

Overview
Normally, Kidō spells are conducted through a series of progression in which the spell's potential power can be unleashed. At first, a spell can be invoked through simply thinking it. Afterwards, one can further strengthen it through physical movement, then calling its name, and then finally utilizing the spell's unique incantation to bring out its full strength. While for novices, the difference is almost negligible, those who have truly mastered the Kidō craft can manifest tremendous difference in their spell's strength by simply uttering its name as opposed to not.

However, there is actually a form of incantation even further than the sequence of phrases used by most Kidō practitioners. It was developed by by ironically drawing inspiration from the  discipline, believing that the only true way to further manifest greater potential from a spell is to infuse the personal essence of one's own self into the spell; in other words, their blood. In doing so, the spell can be theoretically enhanced by a factor of nearly a hundredfold. However, this is all but proven. What is true of the Chiboshū is that it allows even standard experts and masters of Kidō to enhance their spells beyond their normal potential. Infusing a part of their essence allows for an even easier method of manipulating and transforming a spell's behavior and foundation which would normally be considered far too difficult to accomplish otherwise.

Behind the Scenes
This concept was created based on a personal theory that there is some kind of consistency within the Bleach universe that infusing blood into techniques produces some sort of greater effect. Within the series, there are three instances where blood is used in this manner: the first is to produce the, which is a far more potent and dense form of ; the second is the Senkei form of Bankai, which is stated to be his Bankai's true form, thus suggesting that blood is used to invoke his Zanpakutō's true power; and the third is the nameless flame-based technique demonstrated by.