While all those strange events were happening at the surface, down there in the abyss, Lan Xue had just created a blizzard storm to harass the Mana Sovereign beast Seth was engaging in a battle with.
Their team work was already flawless and whenever Seth needed to move in or out of the battle, Lan Xue would cover up for him. Her attack power was obviously good, but what left the strongest impression about her abilities on Seth's mind, were their crowd control and defensive capabilities.
She could practically control the speed at which the battle was happening, giving Seth more time and space to maneuver through the entire field and reposition himself for a better attack.
Suddenly, the Mana Sovereign beast realized it wouldn't be able to keep up with them and decided to use one of its trump cards. But before it was even able to start executing it, it was entirely encased in a giant block of ice, that froze all of its movements.