With this familiar's ability to harden and soften the water at will, Ragus was able to land a couple of hits on the dark child's body. He then noticed that his enemy's body heals extremely fast and small injuries wouldn't have any effect on it. He needed a move that could impede the enemy's healing ability.
With that in mind, he summoned another familiar. It was centaur, with the body of an upper body of a human and lower body of a horse. It was holding a bow and arrow in its hands and with Ragus's command, all his familiars attacked all at once. This barrage of attacks couldn't be compared with that the dark child had faced so far.
The archmage's attack was equivalent to five mages attacking all at once. The dark child was put into a predicament as its healing ability cannot keep up with the attack. It used its tails to protect itself from the attacks but some of it were still able to infiltrate his defense. It was also weakened by its first fight.