Ideas and suggestions.

Replace the mountains on the map with water, and the portal system needs to be reworked; it's difficult to find every portal on large maps, or at least mark them with flags on the map. Dungeons also add a bit of confusion on large maps—it's "clearer" what to do on an open map. It should be possible to jump into a Dungeon and jump back out of it, or add a new spell.

In HotA for 3DM, there are sometimes 3 external dwellings of level 7 creatures in one zone (adjustment needed!). Why not make the objects spawn evenly? Otherwise, when you push out from your Castle, the secondary sites are poorer, which means the chosen direction becomes a deciding factor in such cases.