The Water Dragon Summoning Skill is an extremely common tier ten skill, akin to the Fireball and Wind Blade skills practiced during the Qi Cultivation Stage. Though such skills appear immensely powerful, they are in fact highly unstable and can easily dissipate once hit at a spiritual power node.
Moreover, they have a relatively slow attack speed, putting them at a disadvantage in duels among cultivators of the same stage.
Recognizing these flaws, Yun Mengyao couldn't understand why Xu Mu would bother using such a clumsy skill.
But the scene before her shattered her previous understanding. Her full-force attack didn't manage to destroy even two of the magical giant dragons.