RTF is a global modification that replaces all towns in the game.

What is a gnoll (mammal) even doing in the army of lizardmen (reptiles)?

After the cataclysm, they fled to the lizardmen. They promised them their service in exchange for protection. :)

Added after 59 seconds

By the way, a lizard-arcomage or hydra would fit well at the champion level.

The Tyrannosaurus (not the final name) will be based on the fire dragon.