According to Zhang Yanhang's observations, the strength of these new fire-breathing monsters was roughly around the Third Tier Two-star level, still classified as Early Stage Third Tier monsters.
As for the specific classification of these monsters, if Zhang Yanhang wasn't mistaken, or if the monsters of the Ashen World still followed conventional definitions, they should be the commonly seen Flame Flying Dragons in various games and TV shows.
Or rather, two-legged flying dragons, with only two hind legs and no claws on their forelimbs, just a pair of continuously open broad wings.
Furthermore, the attack methods of these Flame Flying Dragons were very classic, either flying in the sky and breathing fire at him, or dragon breath, watching this group of Flame Flying Dragons flying back and forth like bombers, spewing dark red flames continuously at him, Zhang Yanhang felt it would be wiser to check the Attribute list before launching the Death Wave to kill them.