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

You can also take chains from ghosts or something, or maybe Cyclops have their own.

Cyclops seem to have their own.

Ideally, it would be better if the creatures didn't repeat. Stone monster and monster – both from Cyclops.

We can come up with something else, but we need to remember which creatures haven't been used yet. An angel doesn't fit, the devil has already become a minotaur, dragons don't fit, and only the titan remains, but it's already being used.