The royal dragons took the natural dominator dragon forms. Current stopping and moving toward the water. The remaining water mana he had to spare being used to stop as much of the massive waves being pushed towards the land as possible.
The sheer amount of water displaced as a skeletal corrupted undead wall was made and used to raise some unknown ruins from the ocean was too much to grasp on to. There was so much wrong with what was happening.
But the party couldn't worry about the horrendous act of killing every monster possible to use as fodder for this one skill. They had to help evacuate the forces here. That was why the royal dragons had used their wings to take to the sky.