Paintbrush of Change

Paintbrush of Change (化成の筆, Kasei no Fude) is the unique tool that belongs to Kogomei, passed down from her mother. It has the ability to "record" and "erase" and is used with the Book of Change. It is spiritually linked to the its counterpart and the user through training and has the innate ability to know the location of its user the Book at all times, via writing out the information in thin air. 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 black and red 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, in white ink. On command via saying "Seal", Kogomei can seal one specific trait on that technique, object, or person, and in doing so, the ink will turn black and remain on the sword until she utters "Unseal". Using its power in this form only allows her to seal a single trait at a time, for only one thing at a time, severely limiting its overall power and flexibility.