It has taken me a very long time to internalise the concept of dungeon as "mythical underworld" but now it's so internalised there's not much space left for alternative ways of understanding subterranean adventure spaces.. except as spaces that sit alongside the mythical underworld, one way or another...
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A dungeon is a dimensional rift. Or rather, a Dungeon is an incursion of Chaos into the Wilderness of the Known World. It can be a castle, a cave or even... a dungeon.
The deeper you go, the weirder it gets. This weirdness connects rifts to one another.
All dungeons are connected.