Sand Bullet

Gaara forms a small sphere made of sand and compresses it to increase its hardness. The sphere can strike opponents with such speed and force that it knocks them unconscious. He can also change its trajectory, to strike down multiple targets. By using this one small bullet, Gaara was able to defeat the Suna Assassin Captain along with all his subordinates.

Trivia

 * Though unnamed in the anime, this technique was named in Naruto Mobile.

Bala de Arena