Ooops a wee bit behind here. There's one too many "or"s in the first paragraph

I'm thinking you might want a comma after "the nearest dungeon" in the second paragraph? Or maybe commas surrounding "or transposed"?
Just some thoughts that might be helpful
Before the players can mount expeditions to discover monster lairs, legendary treasures, or territories to occupy,
or the referee must prepare a wilderness map.
The referee’s map must always remain unknown to the players! It should minimally include a village or town where the player can base themselves, the nearest dungeon and immediately surrounding territory.
The referee can create an original, hand-drawn map, adapt an existing map or playing board to serve, or generate a map by random determination.
Whatever the case, the map should be drawn
, or transposed
, onto hexagonal graph paper.
The referee should, ideally, place the major map features thoughtfully, and use random determination to fill out the remainder of the map, as required.