Fire Dragon's Iron Fist

'Fire Dragon's Iron Fist (火竜の鉄拳 Karyū no Tekken): is a Fire Dragon Slayer Magic Spell.

Description
Natsu engulfs his fist in large flames and punches his opponent which makes his opponent fly away. Natsu renamed this ability Cat Fire (猫ファイアーNeko Faiā) while wearing cat mask.