Strange Mask Exploding Flame

By having his fire and wind masks merge or himself merge with them, Kakuzu has both masks use their signature elemental technique and combines their attacks, creating a powerful blast of fire. Kakashi remarked that water alone wasn't enough to put it out. It took the effort of a wind combined water technique to fully counter it.

Trivia

 * While unnamed in the manga and anime, it was named in Naruto Shippūden: Ultimate Ninja Storm 2.