Had a thought for a campaign setting, so I want to check A) If it has already been done, B) If the idea is too crazy.

How about a campaign setting where the original world was eaten by a titanic monster and the "world" now consists of pockets of civilization inside the thing's guts?

Too crazy? Problems?

Sounds fun, go for it.  Would give you "dungeons" wherever you want 'em (various tunnels and such).  Heck, depending on scale, you might have to plow through miles of tunnels just to get to the next settlement.  Opportunities for lots of bizarre bacteria-creatures and antibodies, etc.

Sounds fun! And the ultimate campaign objective could be to force the monster to vomit the world, then (hopefully) reform it through magic. Epic!

Quote from: Shipyard Locked;711238Problems?

I'd say!  If ya hear a faint ♪♫Plop, plop, fizz, fizz, oh what a.. ♫♪♫

That civilization can collectively bend over and kiss its ass goodbye.

The whole world being so is rather novel. On a smaller scale, there was the Snits' Revenge game, and the Nightmare Keep scenario in the AD&D Forgotten Realms line.

It could easily be a variant Starship Warden for Metamorphosis Alpha.

John Varley's novels Titan, Wizard and Demon are set within a planetoid-sized entity.

Quote from: Phillip;711279On a smaller scale, there was the Snits' Revenge game,

OMG!  I had forgotten about that game. I'll have to hunt one down.

To a lesser extent I think the warrens in the Malazan books, the basis for magic in that setting, were basically hollowed out areas in a huge supernatural being. But yeah this sounds like a lot of fun.

That's pretty much the setting for the Thomas Covenant books by Stephen Donaldson.

A giant serpent flies through space eating matter.
It eventually gluts itself and falls asleep and "The Land" grows outside of it's skin.

One day it'll wake up and shake off "The Land", actually Covenant nearly wakes it up when trying to get a branch from the "One Tree".

Sounds cool (and don't worry, Simpsons probably did it already).

There are a lot of interesting ideas to develop here. I'd myself perhaps go with some post apocalyptic vibe - various worlds are locked in this creature, shattered by the teeth, some rebuilt, some regressing, some consumed in the stomach (perhaps all worlds move towards it, but at a slow pace). With such gargantuan creature, I'd be awfully tempted to have also native cultures, made from white cells, red cells, etc. etc (I can't help but think of a dark fantasy style Once Upon A Time...Life). I'd imagine personally some horrible, ant - like tyrannical culture, ruled by the Brainiacs (who travel the body on the thundering bolts of electronic impulses), with White Cells serving as cruel, golemic enforcers. Some worlds are subjugated and live according to the Creature's designs (which usually involves them being forced to chip at the remains of their former world, making it easier to be consumed), some still fight the odd oppression, and some are simply lost in the depths of the creature.

Could also have the creature's "biology" be entirely alien, or simply too small still for them to matter, in which case I imagine people being forced to drink from the rivers of blood to sustain themselves (with civilisations forming along the great rivers, of course), scavenging the intestines for the artefacts of past consumed worlds (having to brave the acidic marshes of stomachs, and fight off the bizarre parasites that'd no doubt live in there).

And I also imagine various crazy cults taking amongst people of this creature - the most dangerous one, of course, being the one that suggests that the Creature is benevolent, trying to bring about quicker the Digestion, where all shall be joined in the Creature, their souls merging and reaching Nirvana.

Thanks guys, I'll tool around with it and see where it goes.

Quote from: Rincewind1;711341(and don't worry, Simpsons probably did it already).

Futurama, actually - well, kinda.

I like the idea as well. Dungeoneering adventures aughta be awesome, as others have noted - from equivalents of bacteria (and viruses! Would these be undead?) to equivalents of white blood cells etc (I like the idea of these being golems or similar).

Of course bigger/more advanced parasites would be...really something. Kaiju.

Oh and lots and lots of psychedelic vistas!

What if the creature finds another from its species? Time to fight / mate?
And if it dies? The Rot Apocalypse?

I think it's an awesome idea.  Sort of taking the concept behind that one movie from the 60s where they shrink themselves and go inside that guy's body.  Fantastic Voyage or something or other?  And I recall seeing a recent illustration of a dinosaur type creature with his insides mapped like a dungeon, but I can't recall where it was.

So I'm not sure if your idea has exactly been done before, but even if there are varients, it's still an awesome idea.

I'm stuck on the ecology of it.

Does it do this often?

Has it done this in the recent past?  Will it eat again in the near future?

How long did it take for it to eat the world, and what was that like?  Swallowed whole or chewed?  Washed down with a gulp of star dust, maybe?

What's it like in there?  Dark and humid, I assume?  All the time/everywhere?

How does it digest?  Acid and absorption?

Stuff like that.

I hate to be a negative Nelly, but I'm not sure that the idea has legs.  

On the one hand, while that might be the nature of the world, do the PCs have a way of determining that's the nature of the world?  

Do they have a way of interacting with the creature in a meaningful way?  

The 'this ain't no cave' is good for a surprise reveal, but I'm not sure it is something that can either support a campaign - or even should.  

What type of stories do you think you'd be able to tell that aren't supported by a more 'standard' world?  

It seems like you'd be getting rid of a lot of things that people tend to expect.  Normal weather, celestial events, etc.