Crimson Lotus: Exploding Flame Blade

Flame Lotus: Exploding Flame Blade (紅蓮爆炎刃 Guren Bakuenjin):is a Fire Dragon Slayer Magic Spell.

Description
After a series of destructive attacks, Natsu finishes with a torrent of blade-shaped flames that strikes the enemy in a spiral formation. Every time the enemy is hit with a blade, it explodes and burns the enemy. Described as the ultimate Dragon Slayer technique, this attack is so powerful and destructive that it has been shown to smash through dragon scales which is known to have extremely tremendous endurance capabilities. This attack was used to defeat Laxus, the Dragon Slayer that uses Lighting, and even caused Gildarts to take two steps back.