Kogetsu/Senkū

The Senkū, is an optional trigger designed for the the Kogetsu.

Appearance
Senkū appearance is similar to that of a blade's sheath.

Abilities
As an optional trigger, Senkū is usable in conjunction with the Kogetsu and by the combining the two, the Kogetsu's blade can be temporarily extended and lengthened for farther reach. It can also be used to bend the tip of the blade as a way of temporarily increasing its speed and power as well. Experienced users of both Kogetsu and Senkū can take advantage of both's abilities to perform fast, mid-range slashing attacks.