I think expert mode should have the 1st and 2nd eye running around throughout the whole dungeon, including the ogre fight, the ogre rages within 5 minutes instead of 10, there should be twice the mobs, all mob levels are increased by 10-20 ranks, batraal's HP is increased by 6 fold, batraal puts up his invisible barrier 3 times more often, and you have to do it all within 30 minutes instead of 60 minutes