d20 chaotic dimensions
d20 dimensions, most are self explanatory. Put a portal to a random one in a megadungeon or something, just make it clear what's on the other side (even that could be deadly). Most will also instantly kill you without precaution or magic protection, good luck :)
- Endless water (it's room temperature)
- Endless caves (no air, tectonic movements threatens collapse)
- Relentless sun (flat hard rock lines the surface)
- Infinite sky (no land, extremely fast winds)
- Sky island (only one, sky-space stretches beyond)
- Flatland darkness (no air, floor is hard dirt-ash)
- Enormous forest (extremely tall trees)
- Infinite doors (stone corridors)
- Eyes
- Meat
- Hyper storm
- Endless mist (connects places)
- Actual space
- Radiance (blinds and smites, no ground)
- Extreme gravity
- Slime
- Vantage point (peak from which everything else can be seen; you feel observed)
- Distortion (warps everything that enters, some never leave)
- Wrecks (endless hulls of lost ships)
- Paradise (this place is perfect, so why do I feel something terrible has happened?)