Ultra-Big Ball Rasengan

The Ultra-Big Ball Rasengan is a larger, stronger version of the Big Ball Rasengan, which itself is a larger, stronger version of the Rasengan.

Normal Version
In an instant, the user creates a Rasengan of gigantic proportions, larger than their own body. When it impacts, there is a large shock wave unleashed that can send unsuspecting shinobi flying. As with many Rasengan-variants, Naruto needs the help of a shadow clone in the Ultra-Big Ball Rasengan's formation.

Senjutsu Version
When in Sage Mode, the user can perform a senjutsu-enhanced version known as. Although it has not been successfully used in the series, it is said that its destructive power – were it to explode – would easily carve away an entire mountain.

Trivia

 * According to its Sha no Sho entry, the standard Ultra-Big Ball Rasengan also uses natural energy.