There seems to be nothing in this cavern beyond what meets the eye. The other side of the door is quiet, and peeping under it reveals it leads to a winding tunnel.

Lester also becomes aware that adventurers can navigate into and out of the tunnels of these caverns, just like they can through the hallways in the garden level. Only depraved adventurers who are hopelessly lost end up in these tunnels.

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Updated Cavern Map above.