[Endoperez]

The easiest answer is to play against Broken Empire ermor only. They don't get huge number of undead for free, their lands are worth conquering, the living half of their armies can still rout, etc.

If you have patched the game, I have made a mod that effectively removes the undead Ermor themes from game for as long as the mod is enabled. I have attached it in this post. Extract the contents of the .zip file into the \mods\ folder in your \Dominions II\ folder. It might be C:\Shrapnel Games\Dominions II\mods, but probably isn't. Once the mod is in the correct folder, start Dominions, and from the start menu, choose first Preferences, then Mod Preferences, then the mod. Then you can play, and will see the mod's icon on the main menu.