Searches of the lost city

I've played this map for the third or fourth time now. I really like it! It's exactly what I enjoy: calm development, many opportunities, and a few interesting battles.
There are perhaps a few too many artifacts. As others have mentioned, it's more interesting to collect them yourself rather than finding them already assembled.
Also, I didn't understand why there are Necropolis dungeons that can't be reached by jumping through the dimension door. I could only reach two of them, and one of them couldn't be captured due to the cursed land.
In any case, thank you very much to the author!