10x Kamehameha

"With x10 Kamehameha, you have to charge up your ki longer than with your run-of-the-mill Kamehameha. While it's incredibly powerful, it also leaves you incredibly vulnerable to attacks, so think carefully before using it. 10x Kamehameha is a powerful technique perfect for finishing off an opponent! Use it to quickly end a battle!"

— Goku explaining the x10 Kamehameha in Dragon Ball Xenoverse 2