Hits a dragon with a wall level stroke and causes it pain

Arthur, having pulled his body back, remained unwounded, and, angry now, he struck his enemy fiercely. He could have knocked down walls with a blow like that, but the enemy, protected by its hard skin, did not receive a mortal wound. All the same, it felt to the depths of its being the terrible pain of the blow. All day they fought in this way, but the serpent did not get a lethal wound.

Life of Efflam