The mushroom farm was here first... then someone experimented with adding some of the more interesting mushrooms to locally brewed beer, with interesting results... The tavern was built and public access to the caverns was walled off to make it easier to keep the secret ingredients secret. These days, the existence of the mushroom farm is not known among the general public...
There are a few other interesting little features, like the roosting cavern for riding bats to stay in - which is what the white floored cavern up the top is... guano covered floor from the roosting bats! - They even have their own little exit window/cave with steps for the riders to climb up so they can easily mount just outside the cave (the river is narrow enough to jump, or put a plank across).
Included:
Happy adventureing
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