Or is it sometimes a portal? Perhaps only at night? and if you jump in, where does it go to? .... Perhaps to a parallel world that has the same landscape, but a different climate? Or to a different time at the same location?
Variations include (with no grids) day, night, pool with and without the fiery glow in the deeps, winter, arid lands, desert/mars, fay and fay night and more.
Map size is 6000x6000 pixles, which is 20x20 squares @300 pixles per square
.... or for Vtt you could use it at 40x40 squares @150pps if you want to.
May the Wild Pool, in one of it's many moods, inspire some interesting encounters for you .....
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