since childhood Asta has intensely trained his body to have incredible physical strength, allows him to wield the heavy anti-magic swords, which cancel out magic. The Demon-Slayer Sword is able to enlarge using anti-magic and reflect back spells. The Demon-Dweller Sword can unleash flying anti-magic slashes and absorb other magic to release as beams. He never knows when to give up he never quits