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

Yes, there's a mod for the undead that includes wolf skeletons, ghost wolves, dark knights made of zombies, mummies, and werewolves. It's decent. I mean, keep the first two vampire upgrades, which are hard to counter, and make the third one werewolves with a chance to cast a spell on hit (randomly either charm or berserk).

I know about that mod – I've talked to one of the authors before. The idea is partly interesting, but I don't like the visuals and the imbalance!

P.S. We need to modify the .exe to increase the number of factions!

Added 4 minutes later

We're using a different mod, and it has different creatures with different abilities!

For example, in WGE (author Nargott), he rebalanced things, and playing against the AI has become significantly more difficult – because the AI uses different ability combinations, but WGE is not an imbalanced mod!