Chidori Senbon

A variation of the Chidori that uses shape transformation to create countless sharp senbon that are fired at the enemy in quick succession. By increasing the amount of chakra used, the number of senbon increase proportionally. When used in tandem with the Sharingan, it becomes far more effective and deadly, as it allows the user to precisely shoot for the target's vital points.

After attaining chakra from the nine tailed beasts, Sasuke's new Susanoo was able to produce large senbon capable of countering Naruto's senjutsu-enhanced Tailed Beast Balls.

Trivia

 * In Naruto Shippūden the Movie: Bonds, Sasuke's precision with this technique proved advanced enough to accurately hit the tenketsu.