Yoki

The Yoki is the energy of a Yoma. When a Claymore is created she assimilates the Yoma Yoki. The claymore used certain amount of Yoki to use special skills like increasing their strength and speed. Many Claymore used their yoki to make some special moves such as Irene's Flash sword.

Known Yoki moves

 * All Claymores special strength and speed
 * All Awakened Beings abilities
 * Irene's Flash Sword
 * Helen's Extension of extrimities
 * Miria's Phantom Images
 * Deneve's Regeneration
 * Ophelia's Rippling sword
 * Jean's Rotating arm
 * Flora's Windcutter

It is unknown if Undine's strength is caused by her Yoki, as well as Rachel, Teresa, Galatea and Tabitha's exceptional Yoki reading ability