Origins of Planet Dungeon

We'd all heard the legends. We even had our own theories of the planet's origin. But nothing could have prepared us for the truth: this place was Hell.

Is the planet a Thu-in prison world? One of the rare, stellar jewels of the Collector? Could this be the long lost homeworld of the ancient Usurpers?

Regardless of how this planet came to be, one thing is certain: it's a death trap.

Outwardly, the planet's surface is a scarred, inhospitable landscape, marred by layers of discordant technology from an endless list of long dead civilizations. There are mercury lakes surrounding spires of gargantuan bone, which border metallic jungles, beyond which lie vast stretches of machine dust deserts, where obsidian-hued obelisks rise up and gaze across the horizon, watching the edges of the world shift and flow like fabric.

Giant, translucent glass spheres float through the air, their purpose unknown. 

Wild storms of dust and electricity form and dissipate with no warning.

Crystalline warriors stalk the land, patrolling the surface and destroying anything they encounter.

This is a harsh world. So why would anyone come here?

Few people find their way to this planet on purpose: often they have ended up way off course, lost and adrift among the stars until they drifted too close to this system. Others were teleported here by the strange glass gateways scattered around the world, from some other place or time. A couple of people have led crazed expeditions, thinking they could unlock the vast secrets buried deep inside the planet.

Whatever brings a person to this world, one thing is certain: the surface is a very dangerous place to be. The only hope for survival requires gaining access to the planet's interior.

D12 Table: Origin Rumor Table

At least one of these is true. Use as needed.

1. The Usurpers called this planet 'home', but they were not the first inhabitants.
2. This isn't a planet; it's a dormant Renjin battle platform. The "surface" has built up from meteor collisions and other debris over a million years, hiding the awful weapon.
3. It's really planet Earth, sent back from the future to avoid destruction when Sol expands.
4. The Thu-in only discovered the planet within the last century, and banished their worst criminals here, all of whom have undoubtedly perished.
5. This was once a part of the Collector's galactic museum, but it was stolen and moved to its current location. The Collector continues to look for it...
6. The entire planet is an illusion, projected by a cabal of mindlinked Thought Wizards from inside one of their prism ships positioned at the 'core'.
7. The planet is a nexus point for all of creation; it is the only known place in the universe where all realities, dimensions, timelines, universes, etc. converge.
8. The planet is the legendary 'Eden', the failed genesis seed world of the Progenitors before their successful terraforming of Earth.
9. It's a rogue dimensional world from an alternate universe. Somewhere, there's an evil empire of goatee-shaved pirates looking for their homeworld...
10. It's the legendary Ixian Manifestor, whose purpose is itself a mystery. One rumor about the manifestor is that it creates a new universe, ripping apart the current one.
11. The planet is a sentient being that feeds on the sense of discovery experienced by new explorers.
12. The planet is actually the exit point of a dimensional portal, through which a hyper-advanced society disposes all of its technological and biological waste.