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. This allows the user to perform it continuously without tiring and with a minimal number of unnecessary movements. However, the user can augment her baseline strength and agility to power-up the technique 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. As a solution, as well as in honor of her former captain, Clare began to use the Windcutter and eventually mastered it.

Windcutter and 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 more precise than Clare's Quicksword. After the confrontation, Flora surrendered the title of "fastest sword among the Claymores" to Clare.