Fire Salamander.

As the flames dissipated, Ark could see a creature with a large frame. The creature looked like a huge lizard, at least four or five meters tall. The lizard had thick and powerful legs and its lustrous red scales reflected the light from the sea of fire, looking quite beautiful. The face of the lizard was hideous, and its expression was even more so. It looked at Ark with intense hatred, as if he had killed its children. 

Ark had an idea about the kind of creature he was facing. As far as he knew, it was a type of Fire Salamander. The only thing that surprised him was the strength it showed. As far as he knew, Fire Salamanders didn't grow to be this strong. Perhaps it had a mutated bloodline? He wasn't completely sure, but he knew that if he wasn't a sovereign, he would have a tough time fighting against it.