Vrock
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As I understand it, the problem lies with the Dominion ring (a modified artifact called "Ring of the Shadow-Stained"). Here's its modification:
This means the ring adds 65 to attack, 45 to defense, 65 to magic power, and 35 to knowledge, as well as 2 to morale and 3 to luck. This is what allows you to win the final battle. If this bonus doesn't occur, it means that among the maps in Maps, UserCampaigns, or some global mods, there is something that conflicts with this map.
I understand. Thank you very much for your answer!
I have the Epic War Age mod installed, and that's where I found your campaign.
But, apparently, the mod developers didn't fully test all the maps, and this conflict with this artifact arose.
I'll try to figure it out.