Yoki

The Yoki is the enrgy of a Yoma. When a Claymore is created she asimilets the Yoma Yoki. The claymore used certine amount of Yoki to use special skils like incraesing their strenght and speed. Many Claymore used thir yoki to make some special move as Irene's Flash sword.

Know Yoki moves

 * All Claymores special strenght 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 exepcional Yoki reading ability