Four-Tailed Fox Menacing Ball

While in his Four-Tailed Fox form, Naruto disperses a massive amount of his chakra and blood into the air which take the form of many bubbles surrounding him. They come together to form a larger bubble that compresses to a smaller ball about the size of a peach pit and swallows it, which explodes within him. Naruto then releases the explosion in the form of a massive wave of chakra from his mouth. The blast is so powerful, that it was capable of destroying three Rashomon gates without losing any of its momentum. Orochimaru has noted that if he were attacked by the ball or its feedback, he would surely be killed.

Trivia

 * This jutsu has been used and named as Four-Tailed Fox Menacing Ball in the game Jump! Ultimate Stars.
 * In Naruto Shippūden: Ultimate Ninja 5, it is named "Kokuhō" (虚狗砲).
 * Apparently the jutsu is actually called the "Menacing Ball" and it can be charged with different levels of power.