Bab 245: Rising Heat.

As the White Flame Sovereign screeched in pain and anger, the fire mana in the entire dungeon went haywire. A sea of fire surged out from where the White Flame Sovereign stood, completely consuming the entire dungeon. The only space that was unaffected by the sea of fire was Ark's [Chaos Domain]. Thanks to it, he didn't need to worry about the sweltering heat that came from the immense fire magic that was trying to consume him at every cost. 

The White Flame Sovereign could see that its flames had little to no effect on Ark, and its body made up of white flames started trembling. A small amount of its body dissolved into the sea of flames, sending white embers in the direction of Ark's domain. Ark could see and feel the power that came from the white embers, and he quickly reacted. At the periphery of his domain's boundary, Ark created a thin water membrane that he fused with chaos magic.