Black Blade Shadow Strike

Dark Magic: Black Blade Shadow Strike (闇魔法『黒刃・影打』) is a Dark Magic spell.

Description
Similar to Dark Cloaked Black Blade, the user coats their sword in darkness, increasing the strength of its slashes.

Trivia

 * In the game Black Clover: Quartet Knights, this is young Yami's Ultimate Magic. It temporarily increases the damage his sword attacks do and reveals the positions of nearby enemies behind walls.