Karma Demon: Iron Spiral

Karma Demon: Iron Spiral (業魔・鉄螺線形 Gōma Tetsu Rasen) is an anime-only, Iron Dragon Slayer Magic Spell.

Description
The second ultimate Iron Dragon Slayer move. Gajeel uses his Magic to transform his legs into a giant drill. He used this move to attack the red center spot of the Dragonoid to free Natsu from his prison. Although it did what it was intended to do, Gajeel acted cool and tough, saying that he still had a long way to go, since he "planned" to destroy the whole Dragonoid, along with Natsu.