It's a joint Special Move created and used by Masamune and King and theirs Blitz Striker 100RSF and Variares D:D.
Beyblade: Metal Fury
It is a Joint Special Move of King of Thundersword and Flash of Lightning. When the beast of Striker and Variares comes out, Striker being rode by Variares. Striker dashes towards the enemy with it's horn pointed forward and Variares raises his sword and strikes the enemy, creating a Special Move with four times the original strength. It's first and only time being used was in the team battle with Yu Tendo against Hershel and Keyser.