Tags
Cave, Cavern, Caverns, Caves, Commercial Maps, Dungeons & Dragons, Fantasy, Labyrinth Lord, Maps, Old School Essentials, OSE, OSR, RPG
On a promontory overlooking the Dry Bay is a tower that was once a lighthouse. Under the lighthouse are some old sea caves that are now open to the air. The caves are not linked to the structures above, but are used by the same faction that currently uses the lighthouse as a lookout. The caves provide a lot more living space and catch a decent breeze to keep the air fresh within (at least in the upper set of caves).
The upper level contains some living space as well as a cave hidden away and kept locked which is used for storage. Doors have been added to several sections of these caves to control movement and to keep people out of the lower caves. The lower caves have a strange and magical circle of rocks, a weird monolith that emits UV light, and a small finished chamber in the lowest portion that must have some mystical significance…
The 1200 dpi versions of the map were drawn at a scale of 300 pixels per square and are 9,600 pixels (32 squares) wide. To use this with a VTT you would need to resize the squares to either 70 pixels (for 5′ squares) or 140 pixels (for the traditional 10′ squares) – so resizing the image to either 2,240 pixels wide or 4,480 pixels wide, respectively.
This map is made available to you under a free license for personal or commercial use thanks to the awesome supporters of my Patreon Campaign. Over 500 amazingly generous people have come together to fund the site and these maps, making them free for your use.
Because of the incredible generosity of my patrons, I’m able to make these maps free for commercial use also. Each month while funding is over the $300 mark, each map that achieves the $300+ funding level will be released under this free commercial license. You can use, reuse, remix and/or modify the maps that are being published under this commercial license on a royalty-free basis as long as they include attribution (“Cartography by Dyson Logos” or “Maps by Dyson Logos”).
Please note that the promotional version of this map (the one with the brown paper background) is not included in this commercial use license and the text and name of the map are NOT released under this license, and cannot be used in conjunction with this map in a commercial project.
Dyson's Dodecahedron 
This would work well for something Tékumel in the Dry Bay of Ssu’um.
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Oddly, I ran a D&D5e one-shot a couple of months ago that featured a large crystal shard that emitted UV light. Shards of the crystal had corrupted the miners – the humans had died, while the hardier dwarves had simply fallen under some kind of supernatural control. Movement in the cave would occasionally cause the crystal to eject a spray of fine shards, which would hit those nearby who failed to dodge, potentially poisoning the characters.
The party’s thunder cleric decided that Fog Cloud was the ideal spell for the circumstances, resulting in what was rapidly nicknamed the ‘Dwarven Death Disco’, as the figures of the corrupted miners were periodically outlined in the thick fog by pulses of diffuse purplish light.
(He did then charge in, downed half the miners with Thunderwave, and proceeded to get downed himself by the corrupted dwarven barbarian mine guard, but it was a valiant and dramatic effort. We don’t talk about what the other players were doing …)