Subdimensions & Where to Find Them.

The multiverse is filled with extra dimensional spaces, pocket planes, temporal knots and astral prisons. It is as if reality itself is porous and blurred, with the surrounding spheres of existence constantly trying to invade the prime material. These numerous spaces have sprung into being by various means, whether through the power of the arcane or divine, or simply through strange quirks of circumstance. For every time capsule or treasure room, there is an oubliette containing some mind-bending horror or cursed artifact. Those who probe these places do so at their own peril.

GMs who wish to throw one of these place together on the fly can simply roll 6d8, then d4s for each of the sub-results - the size table does not have sub-results. Please note that some of these combinations are quite dire, or nearly impossible to escape without some sort of telegraphing on the GM's part.

d8	How do you get in?
1	Sacrifice: 1 - Blood, 2 - Life, 3 - Wealth, 4 - Food/Drink.
2	Stars are Right: 1 - Solstice, 2 - Eclipse (any kind), 3 - No Moon, 4 - Full Moon.
3	Time: 1 - Daybreak, 2 - Noon, 3 - Sunset, 4 - Midnight.
4	Weather: 1 - Clear & Sunny, 2 - Windy & Raining, 3 - Snowing, 4 - Drought.
5	Feeling: 1 - Hate, 2 - Love, 3 - Fear, 4 - Pride.
6	Song: 1 - Local nursery rhyme, 2 - Bawdy tavern tune, 3 - Local dirge, 4 - Love song from a far away land.
7	Ritual: 1 - Worship, 2 - Combat, 3 - Lovemaking, 4 - Bargain.
8	Test: 1 - Puzzle, 2 - Faith, 3 - Riddle, 4 - Skill.

d8	What or Who is inside?
1	Prisoner: 1 - Outsider, 2 - Great Old One, 3 - Hero, 4 - Deity.
2	Treasure: 1 - Wealth, 2 - Arms & Armor, 3 - Books & Scrolls, 4 - Fine Art
3	Artifact: 1 - Guarded by a powerful creature, 2 - Surrounded by arcane and mechanical traps, 3 - Locked behind a devilish puzzle, 4 - Laying in the open.
4	Tomb: 1 - Memorial to a dead god, 2 - Monument to a vanished culture, 3 - Grave site of a powerful culture hero, 4 - Ossuary of dishonored dead.
5	Abandoned: 1 - No trace of anything, 2 - Signs of a violent struggle, 3 - Dusty and desiccated remains, 4 - Fresh & bloody corpses.
6	Community: 1 - Scholar's retreat, 2 - Precursors, 3 - Religious Sect, 4 - Squatters.
7	Threat: 1 - Powerful, hard to kill beast, 2 - Dangerous spell or magic, 3 - Alien invasion force, 4 - Deadly disease or virus.
8	Portal to another place or time: 1 - Future, 2 - Past, 3 - Somewhere nearby, 4 - Somewhere far away.

d8	What is the environment like?
1	Natural Terrain: 1 - Mountains, 2 - Forest/Jungle, 3 - Desert, 4 - Wetlands.
2	Fractured: 1 - Temporal Distortions, 2 - Floating chunks of land, 3 - Flatland, 4 - Ghost world, overlaid with reality.
3	Subterranean: 1 - Caves, 2 - Worked stone halls, 3 - Volcanic tunnels, 4 - Hollow Earth; roll again on this table and use another result.
4	Elemental: 1 - Air, 2 - Earth, 3 - Fire, 4 - Water.
5	Alien: 1 - Barren rock, 2 - Gas Giant, 3 - Space station, 4 - Comet.
6	Structure: 1 - Tent, 2 - Castle, 3 - Wooden abode, 4 - Skyscraper.
7	Void: 1 - White and featureless, 2 - Black and featureless, 3 - Unending and gloomy fog, 4 - Endless reflections of whatever is already inside.
8	Vehicle: 1 - A Cart or Caravan, 2 - Boat or Ship, 3 - Spaceship, 4 - Airship or some other flying contraption.

d8	Who or What made it?
1	Eldritch: 1 - A Wizard did it, 2 - Experiment gone awry, 3 - Psionics, 4 - Repeated plane shifting.
2	Cult: 1 - Long since vanished, 2 - Still active and defending the area, 3 - Forgot about their own creation, 4 - Actively trying to destroy the portal.
3	Deity, who is: 1 - Still active and watching the area, 2 - Alive, but has forgotten their creation, 3 - Long vanished, 4 - Dead, murdered by their enemies.
4	Precursor race, who are now: 1 - Long dead, 2 - Devolved into savagery, 3 - Nomads, barely clinging on, 4 - In some kind of stasis nearby.
5	Outsider: 1 - Celestial, 2 - Fiend, 3 - Great Old One, 4 - Interdimensional invaders
6	Natural: 1 - Leyline, 2 - Conjunction of the spheres, 3 - Overlaid with Astral location, 4 - Left over from Creation.
7	Technology: 1 - Crashed space ship, 2 - Long forgotten artifice, 3 - Byproduct of some strange engine, 4 - Experimental device.
8	Catastrophe: 1 - Battle, 2 - Death of a powerful Outsider/Deity/Magic-User, 3 - Destruction of an Artifact, 4 - Weapon of terrible power.

d8	How do you get out?
1	Song: 1 - Local nursery rhyme, 2 - Bawdy tavern tune, 3 - Local Dirge, 4 - Love song from a far away land.
2	Sacrifice: 1 - Blood, 2 - Life, 3 - Wealth, 4 - Food/Drink.
3	Feeling: 1 - Hate, 2 - Love, 3 - Fear, 4 - Pride.
4	Test: 1 - Puzzle, 2 - Faith, 3 - Riddle, 4 - Skill.
5	Ritual: 1 - Worship, 2 - Combat, 3 - Lovemaking, 4 - Bargain.
6	Fasting: 1 - Food, 2 - Sleep, 3 - Sex, 4 - Drink.
7	Relinquishment: 1 - Anything gained inside, 2 - Carried clothing, 3 - Any food or drink, 4 - Knowledge, in the form of a journal or log.
8	Magic: 1 - Casting a resonant spell, 2 - Praying to an appropriate deity, 3 - Death or destruction of an inhabitant or local object, 4 - Asking for permission from the plane itself.

d8	How big is it?
1	Fairly tiny, a couple of rooms
2	A small house, three or four rooms.
3	Huge house, eight or nine rooms.
4	Mansion, a dozen rooms.
5	Small building, a couple of blocks.
6	County fair or estate.
7	A country or small kingdom.
8	Small continent.