Arthur passed through that gigantic whirlpool feeling like his body was torn to pieces by the impact. It wasn't the water which caused this but the assault of strange strength and energy that kept pressuring over him.
"Dammit! It's that bastard's energy," Arthur was already familiar with the energy from the dark angel grandmaster mage. He didn't hesitate to use his own energy pillar to assault this hostile energy and nullify it.
The clash was fierce, however that didn't prevent him from pushing himself deeper. He felt repulsive force coming from the deepest part of this hole, but that didn't stop him.
He expected such a situation. After all this was the main base of the grandmaster's attack on his empire. Such a base must have some sort of fierce protection. But to dominate it, Arthur had to crush that residual force in the heart of this flying island.