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

Well, Demilich is primarily an uberlich who doesn't have a full physical body or a phylactery. That is, it's almost like a spirit. And here, it's closer to the classic version.

That's also true; I have a neutral attitude towards Demilich with a normal body because I first saw this word in the resources of the fifth game (for those who don't know, this is what the Archlich model is called).