Crimson Lotus: Exploding Flame Blade

is a Fire Dragon Slayer Magic Spell.

Description
The user ignites their arms and generates long torrents of flames from them, which move to hit the enemy in a spiraling formation. Each connecting strike seems to generate a powerful, burning explosion; an even larger explosion was shown ending the barrage when Natsu Dragneel used the attack against Gildarts Clive. This spell has been described as the ultimate Dragon Slayer technique. It was powerful enough to defeat a worn-out Laxus Dreyar, force Gildarts to take two steps back when attacked by it, and even more powerful than Sting Eucliffe and Rogue Cheney's Unison Raid: Holy Shadow Dragon's Flash Fang.