Onimaru

Onimaru is a Tenga Goken Spell.

Description
By crossing their arms and subsequently swinging them outward, the user is capable of creating a large, intense shockwave that can slice both easily and cleanly through rock.

Trivia

 * Onimaru is one of the five famous swords known as the "Tenka Goken" that was used during the Muromachi period of Japan.