Book of Change

Book of Change (化成の本, Kasei no Hon) is a unique tool that belongs to Kogomei, passed down from her mother. It has the ability to "bestow" and "engender" and is used with the Paintbrush of Change. It is also linked spiritually to its user as well as its counterpart, and has the innate ability to tell there the user and the Paintbrush is at all times, as well as who is currently holding it, by displaying the information on one of its blank pages. It possesses the ability to change its appearance as well as its size to meet the current task at hand, often taking the appearance and size of earrings when not in use. When disguised as a weapon, it takes the appearance of a normal katana. It is imbued with Yin Release and Yang Release chakra. It has the ability to shield itself from being destroyed or harmed, by emission of a unique force field that surrounds it. Kogomei also uses it as a melee weapon by changing its size for use in combat.

When in sword form, she is able to use it as a normal sword, but it also has a portion of its normal ability in this form. Using it in combat, she can strike an object or technique and its traits will appear on the sword in the form of a a few words describing the object or person itself as well as a basic sum of their abilities, in black ink. On command via saying "Change", Kogomei can change one specific trait on that technique, object, or person, and in doing so, the ink will turn white and remain on the sword until she utters "Revert". Using its power in this form only allows her to change a single trait at a time, for only one thing at a time, severely limiting its overall power and flexibility in this form.

When using this with her unique juinjutsu, she is able to change 3 things about the object, thing or person in question, as long as it doesn't physically change their body.