1) The Academy city gets a new building.
2) The second tier of mage creatures is changed as follows:
Rakshasa - level 4 (A decent melee unit, but vulnerable in terms of hit points).
Mages - level 5 (Depending on the upgrade, either a powerful buffing ranged unit or a chaos mage).
Djinn - level 6 (Either a Sultan - stronger and tougher, or an ethereal but weaker unit).
Djinn are a bit weak for level 6, but they compensate with numbers thanks to the building in the mage city (bonus +2).
That's probably it. Have fun playing!
Installation: Open the archive, extract the "pak" file from it, and move this file to the game's data folder.