Chihenkeiseito

A unique tool utilized by Yosoi Chinoike, these weapons can create from the blood of several of her blood techniques, and as a result, displays their abilities. Upon contact with a target, it actively transmogrifies the target into blood as the tool itself absorbs the said blood, becoming more powerful and dense in the process. It has the ability to multiply at the users will can possesses enough raw cutting power to literally cut through the armor of a Complete Body. At will, Yosoi can increase their size to large proportions and even use them at spinning, blunt weapons.

Trivia

 * Yosoi can also create these weapons from her sword and vice versa.