Strange Mask Exploding Flame

By having his fire and wind masks merge, with or without him, Kakuzu has them combine their fire and wind attacks to create a powerful blast of intense fire. Kakashi remarked that water alone wasn't enough to put it out. It took the effort of a wind-enhanced water technique to fully counter it.

Trivia

 * While unnamed in the manga and anime, it was named in Naruto Shippūden: Ultimate Ninja Storm 2.
 * In Rock Lee's Springtime of Youth Full Power Ninja Chronicles, this technique is called.