Billy-no-mates
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I think the game lacks a few types of terrain: snow, swamps, etc.
Therefore, they will appear in the expansion pack, and a certain castle will be tied to each terrain, for example, snow-mountains-dwarves, swamp-creatures like in X3, steppe-orcs.
Orcs will definitely be included because they are in Dark Messiah but not in Heroes, which is strange.
It seems the plot will be about the confrontation between dwarves and orcs.