Greetings all,
great setting, taking shape nicely I think! It's certainly gotten the old creative juice flowing.
I'm perticularly intrigued by the "transitive sea" bit of it. I don't know if anybody's given some thought to it yet, but here goes... If big islands "move" relative to another then :
1) BOAT ISLANDS : smaller, (faster?), ones might as well. I'm thinking rocky icebergs going from backyard to mountain size that (randomly?) wander the seaways, hazard for navigation, home to small fishing/raiding/scholarly comunities, strange keeps, lone hermits and/or fantastic creatures.
2) THE GRINDSTONES : If we're talking movement, then eventually, inevitably we're talking about *collissions*. Most of them would be slanting, grinding, earthquaky affairs (though head-on jams/mountain building, followed eventually by mountain *parting*, could occur). We could posit a chain of islands that are always chaotically churning around each other, parting and closing, passing through each other, grinding themselves away into smaller and smaller chunks. Navigating between would be chancy at best, jumping from one to the next a game for the brave. The entire chain might itself be on a long eliptical orbit around the main islands, coming back for a visit say every 50 years or so : think comet, think earthquakes, think rocks in a pinball machine! The Grindstones would be an ideal base for an entropy-worshipping bunch (something like Planescape's Doomguards maybe (always did like them
).
Main text said:
...is studded with many islands, island chains and other geographic oddities that span a range of regions; even the fluid connections between islands shift over time, usually slowly, but occasionally with great speed.
3) JELLY SWAMP : when I first read this I thought you meant the *fluidity* of the water changed... and then I thought : why not? Which leads me to... bacteria. When enough food is avaible/XYZ conditions are met, a certain kind of TI bacteria multiplies and gels, forming zones of jelly sea, sometimes hard enough to walk on (if somewhat slushy and highly wobbly). Most of it though is floating, muddy, sink to your doom stuff clumped around the more suportive bits. I see some of it floating below the surface (channels), some of it just above or below, home to sometimes expansive vegetation : voila! a floating swamp, a sargasso sea navigable only with shallow-going boats (canoes, etc) or by somehow clearing the stuff from in front of your ship. You can have sea-going free-floating varieties or anchored to a shallow bottom varieties, perhaps forming a crown around a central island, atoll-like. An ideal environment for aboleth and their slime magic, kua-toa, sahuagin, etc. Under-water chambers/pods/bubbles and/or passages are of course the norm.
Binder Fred, hoping that was helpful.
Next, underwater...