Many years I was trying to play this ultimate map of Age of Wonders - the ultimate expirience, but crashes, broken saves, uncompleting quest jeopardize my expirience. But finally I've found what caused most of them and fixed the main part.
1. Some things to mention before playing:
As long as I know some broken save was caused by reflecting pool - so this is meant to play with AoW MP Evolution or UPatch 1.5 (if reflecting pools was fixed there).
2. If you can't finish some quest - save-load it would finish eventually. This is a must because it breaks the game.
3. Save often approx once in 10 turns
1. Spirit Quests couldn't be completed from approx. after 20 turns of play.
2. Armies stuck on the map because some of them stacked on one hex
With love and gratitude to this masterpiece by The Groll. Finally it could be played at full strength!
Map is still bugging out at some point for me.
Playing as Shadow Demons mainly, and it doesn't seem to be the Seeing Waters/Reflection pools bug (as that one didn't let me load a savefile, but didn't downright crash/close my game).
I tried different versions, starting with UP1.4, then UP1.5, and MPE2+UP1.5 additions.
It's just that in rare occasions the game just closes during CPU turn.
Furthest I got is turn 141 before this happens.
Not sure if playing anoher race helps, but I recommend trying the others if you want to enjoy this scenario - chances are, maybe the bug doesn't happen. For info; It looks like this crash usually happens between CPU turns of 2nd/Nomands and 4th/Tigrans, as far as I could check.
Playing those might be the safest bet, and maybe I'll do so myself to potentially even find out what causes the crash.
Edit info: Playing the map through MPE (no matter if loading old savegame or opening a new session) gives me some glichty map graphics, so the map for me is way more fun without MPE, for all of the beautiful visual work done by The Groll shouldn't go to waste.