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

http://heroescommunity.com/viewthread.php3?TID=28720

Oh, this is an old mod; I didn't check all the units, so I didn't go into the Fortress on the hill, but the AI did. I only remember the fire hydra that spits fire all around, and the cave lord, who also left fiery marks on the battlefield, but he had a unique attack pattern, attacking in a line across the entire field.