Ryūraisen

was a technique that was acquired by Bankotsu's weapons, Banryū, after embeddeding with Shikon Jewel shards.

The attack allowed Bankotsu to use Banryū's to generate a thunderstorm and launch a bolt of lighting into the sky, which turned into several lightning bolts that would scatter and strike his enemies below. 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 and his friends during their battle at Hijiri island. The entire area was hit by lighting and managed to hurt Inuyasha and all of his friends.