I thought of this as a final level addition to Explorers potentially.. It's a
skill that increases slowly over time and randomly while running around in
outworld, you'll discover a randomly generated old ruin, abandoned temple,
haunted castle.. .you get the idea.
As your level increases, you discover a wider range of randomly generated
areas with a potentially increasing difficulty level.
These areas could also hinge upon a certain guild.. You need the orcish
lore of a folklorist to access the orc clan burial ground or A ghost
liberator to banish the protective spirits of a cursed castle.
you get the idea.
Difficulty levels could be similar to that of ships..
IF you linked it to explorers tho.. it would necessitate someone spending
5 levels to get it.