Wind Release: Drilling Air Bullet

To use this technique, Shukaku will first take a deep breath, and then pound its stomach to apply external pressure, the power of which it uses to shoot a highly compressed air ball from its mouth. The expelled air ball is mighty enough to hollow out the ground, and level an entire forest. Because of the large quantity of chakra kneaded into it, it explodes the moment it reaches its target, dealing an enormous amount of damage, as well as levelling anything in its path.

Trivia

 * Shukaku is the only tailed beast known to use an actual technique as its form of projectile. All other tailed beasts instead gather raw chakra to form Tailed Beast Balls. However, Shukaku, like all tailed beasts, is still capable of producing Tailed Beast Balls.