Regarding the ancient dragons speaking the general language of the continent was considered reasonable since they have been the previous masters of these continent, also they possessed extraordinary intelligence, giving them the ability to strategize in battle and even learn from their past mistakes. Even though an animal speaking looked strange, no one could complain since the lizardmen were more like animals as well.
But this case was quite different, Derik and the other two were pretty sure these green beasts were not from this planet, guessing from the way they talk. Their aura was foreign and their internal body structure looked the same but was clearly different in some ways.
Didn't they just arrive? How did they learn their language so quickly? It just doesn't make sense!