Normal Gravity: Gravity is the same as it is for your regular campaign.
Timeless: In the World Serpent Inn, creatures do not age. They do hunger and thirst, however, so food is provided from a kitchen alongside the common room. This kitchen, in turn, connects with vast catacombs and warehouses
Infinite Size: Though the World Serpent Inn is limited by walls, floors, and ceilings, it extends forever.Visitors can wander through the back passages and chambers forever, or until they find themselves back in the common room.
Alterable Morphic Trait: The items and terrain native to the plane can be affected by normal actions (brute force, magic, and the like).
No Elemental or Alignment Traits: The World Serpent Inn has no tendencies favoring one particular element or alignment over another.
Minor Positive Energy Dominant Trait: The World Serpent Inn has a mild affinity for positive energy, which makes it seem more vibrant than most other planes. All individuals in the Inn gain fast healing 2 and may even regrow lost limbs over time.
Impeded Magic/Psionics: All spells, powers, spell-like abilities and psi-like abilities, whether arcane, psionic or divine in nature, are impeded within the World Serpent Inn. To cast a spell or use a spell-like ability, a creature must make a successful Spellcraft check (DC 15 + the spell’s level).
Damage Reduction: While within the common room of the Inn, all individuals gain damage reduction 10/–. Leaving the common room negates this benefit.
Visibility: This unique trait of the World Serpent Inn grants all within the ability to see invisible to the limits of their normal sight range as though affected by a see invisibility spell. As a result, invisible and ethereal creatures are plainly visible to everyone with any sort of visual capability, though ethereal beings remain incorporeal. Potions of invisibility and rings of invisibility simply do not function here.

The World Serpent Inn exists everywhere and nowhere. It is a physical reality, a philisophical quandry, and a spiritual oasis. It is the crossroad of all universes, but belongs to none. Here you can find wanderers, adventurers, lost souls, and new friends from any and all universes. Some are just passing through. Some have settled in for some duration, and yet others decide never to leave and become a permanent part of the Inn’s staff. However you path leads you, welcome and merry met.

Structure
The World Serpent Inn consists of a common room built around a central bar and surrounded by a maze of shifting, ever-changing back passages and rooms, which extend into infinity, often looping back to the main room. The plane has its own border Ethereal Plane and it overlaps the Plane of Shadow.

Portals to the World Serpent Inn exist in a tavern called The Wild Goose in the Artisans’ Quarter of the Free City of Greyhawk and Helkam’s Pit in Irongate. There is at least one portal to the World Serpent Inn in Sigil, the extraplanar City of Doors, and a portal outside the gate-town of Ecstasy in the Outlands. Countless other portals exist in the World Serpent’s many back rooms and passageways, most of them temporary.

The key to the portal in the front of The Wild Goose involves knocking on an imaginary door and invoking the name of any deity.

Description
The inn’s common room resembles an ancient tavern with wooden floors and beams, though precise details vary depending on the visitors and their world of origin. The other rooms and halls vary wildly in materials used to make them. The barkeep is a fat, white-bearded man called Mitchifer. If examined closely, it becomes clear that Mitchifer’s “beard” is actually a mass of white snakes, and his eyes contain black doors instead of irises. The servers, like Sharinda, are generally female faerie gnomes called “serpent wenches.”

It is difficult to cause harm to other creatures while in the World Serpent Inn, and wounds heal much faster than they do on most other planes. Visitors to the Inn do not age, but do experience hunger and thirst. Ethereal, intangible, and magically invisible creatures are plainly visible while in the World Serpent Inn.

Visitors to the inn are many, including dead races, unborn gods, and engineers of worlds yet unmade. Regulars include the lizardman Phoebus.

History
Some sages have suggested that the plane on which the World Serpent Inn is constructed is a fragment of the World Serpent archetype, a divine being of which the gods Merrshaulk, Shekinester, Jazirian, Io, and perhaps even Asmodeus are mere aspects of, and that the rooms and portals of the plane are created by that being’s dreams. There is, however, no hard evidence of this beyond the inn’s name. The inn itself is centuries old, said in many descriptions to have been created by the mercane trader Ilyndele of the Arcane, the illithid High One Sharth, and a third creator whose name varies depending on the tale. Most Oerthly sages agree that the third creator is from the world of Oerth, however.

The room seemed to be made from the same blue mist that had filled the corridor, apart from several fluted columns that were made of a luminous white stone. In the centre of the chamber was a circular bar that was illuminated from above by a shaft of light and tended by a corpulent man who seemed to radiate joy and good will from every pore. The rest of the bar-staff consisted of gnomes. As my companions arrived The World Serpent Inn had at least fifty other patrons; many were races they recognised, elves, dwarves, etc., if rather exotically dressed as if from far-off lands. Others were beings which many would call “monsters” and still other were beings the like of which they had never seen. Later my friends would describe seeing Illithids, Efreeti, what looked like a drunken beholder except it’s tentacles were overly long and ended in crab-like pincers, a 12 foot giant with blue skin and a being which looked like a cross between a 9 foot eel and a giant spider. All the beings in the bar were freely drinking and talking.

The bar man, Mitchifier is always pleased to see new faces and eager to hear any tales they have to tell.