Kaze no Kizu

From InuYasha

Kaze no Kizu (風の傷; English TV "Wind Scar"; Literally meaning "Wound of the Wind") is a special attack technique featured in the manga and anime series InuYasha. The technique is the base attack of the phantom sword Tetsusaiga, currently wielded by InuYasha.

This attack is accomplished by finding the rift, or scar, between the powerful yokai auras of Tetsusaiga's wielder and the opposing demon. Once the Wind Scar is found, the wielder of Tetsusaiga can swing the sword into the rift to release a powerful energy wave that has the power to kill 100 yokai in one strike.

Inuyasha used the Kaze no Kizu for the first time unintentionally when he was trying to save Miroku so he wouldn't use his Wind Tunnel. When the wielder becomes proficient enough, the Kaze no Kizu can be released at will.

Built upon this attack is the more powerful attack called Bakuryuha.