King of Flash of Lightning Thundersword

It's a joint Special Move used by Masamune and King and theirs Blitz Striker 100RSF and Variares D:D.

Beyblade: Metal Fury
Variares and Striker attack together. Variares' beast rides Striker's beast and then they attack with the sword and the horn. They used this Special Move once, in Episode 37 against Keyser and Herschel.