Windcutter

Flora (the Organization's former No. 8) is the creator of this technique, earning her the title "Windcutter Flora."

After the seven-year timeskip, Clare (the Organization's former No. 47), in memory of Flora, was shown to have mastered the technique, using it effectively during her battle with Agatha.

Usage
The Windcutter is a lightning-fast slashing attack, similar to the Quicksword, that involves drawing, swinging, and resheathing the sword in the blink of an eye. It is shown to be very accurate and fundamentally does not require any yoki to execute; however, the user can augment the speed and power of the technique by releasing yoki if she so wishes.

After the Northern Campaign, the Seven Ghosts were forced to suppress their yoki auras. Since the Quicksword uses yoki, Clare was forced to seal away the technique or risk leaking yoki into the world. As a solution, as well as in honor of her former captain, Clare began to use the Windcutter and eventually mastered it.

Comparison between the Windcutter and the Quicksword
After the first skirmish in Pieta, Flora challenged Clare to a quick duel in order to test her Windcutter against the latter's Quicksword. After the duel, it was determined that Flora's Windcutter was slower, but had more precision and strength than Clare's Quicksword. After the confrontation, Flora surrendered the title of "Fastest Sword Among The Claymores" to Clare.

Although the Windcutter is slower than the Quicksword, it's accuracy and power are above that of the Quicksword, thus making the techniques comparable in combat power. The Windcutter's use of intrinsic arm strength in favor of bursts of yoki also allows it to be used by warriors who have their yoki suppressed. It should be noted, however, that Clare's version of the Quicksword is considered to be slower and less physically powerful then the former Number 2, Irene. Thus, it is unknown how the Windcutter would fare against a Quicksword-using opponent of greater power and yoki control.

While both techniques are similar in nature they are in fact fundamentally opposite. The Quicksword's acceleration is based almost solely on yoki, requiring that the user release a very high percentage of yoki into an arm, essentially causing to arm to momentarily Awaken, while at the same time tightly controlling the released yoki so that the rest of the body is not affected. In comparison, the Windcutter relies on almost no Yoki release, instead utilizing physical strength and agility.

Despite the similiar appearance of the two techniques their utilization does not overlap. A user of the Quicksword cannot naturally use the Windcutter if they lack the natural agility and arm strength to do so. The reverse, therefore, would also be true: without strong natural willpower a user of the Windcutter could not control the release of yoki required to perform the Quicksword. This is demonstrated in the fact that Clare required many years of honing her basic sword speed to become capable of using the Windcutter, despite already knowing the Quicksword.