Ryūraisen

was a technique that was acquired by Bankotsu's sword Banryū after being embedded with Shikon Jewel shards.

The attack allowed Banryū's wielder to generate a storm and launch a bolt of lighting into the sky, which turned into many lightning bolts that would hit the ground. It has incredible range, but a drawback was that the wielder of this attack could not control where the lighting would strike.

Bankoktsu used this attack against Inuyasha during their battle at Hijiri island. The entire area was hit by lighting and managed to hurt Inuyasha and all of his friends.