Walkthrough for the "Tribes of the East" expansion.

Please help, I can't complete the last map in the Arantir campaign. I placed 4 heroes in the designated spots, but nothing happens. How do I perform the ritual to remove the barrier? I've done everything as instructed. I freed the hero from the dungeon. What am I missing? - I really need help here! I've been stuck for 3 days, I've cleared everything, captured all the mines, explored everything - I even found the word "EXPERT" Necromancers (who are supposed to stand in those 4 spots - I leveled each one to 15, got Expert Dark Magic, placed them all in the spots 10 times, and NOTHING!!! What should I do??? :smile35: If anyone has any ideas, please post them here as soon as possible... Or, if not, maybe someone can share a save file from the moment they passed through those stupid gates?