5E Planescape Campaign

After an hour of stepping through the shop door, you realize that whatever portal you stepped through was one way. And as you finally look around, a sprawling city stands before you!

And above you! The whole of the city looks to be shaped like a circle, but set inside of a wagon wheel.

Not to mention, in the space of 5 minutes, you see a number of strange wonders...

A fiend and a celestial having something to drink at a local cafe, smiling, laughing, and being civil to each other

A series of signs and fliers, proclaiming that all factions are outlawed from the city, and any known member will be arrested on site, and executed, as decreed by the Lady of Pain, her will be done.

A 6 foot frog, on it's hind legs in a fist fight with three armored men, only to be put down by a kiss from a beautiful tiefling woman

A man you thought to be a harmless old bum stretches his limbs around a passing well dressed dandy, screaming "your mine bounty, whiskey tonight!". The limbs wrap around the dandy like rope, entangling him. The dandy bursts into flame, scorching the bounty hunter, and he runs down the street on fire, leaving smoldering footprints.

Strange, floating creatures toil on repairs, and clearing vegetation from buildings, and repairing holes in the streets. They appear to be communicating with each other using a series of symbols that appear floating above their head.

A halfling woman is leading a group around the area, giving them a running history of the area. The party includes a human man, a githzeri, and a creature that can only be described as a box with wings, arms and legs. As the tout leads them around a corner, you hear a scream and the group comes running back, being chased by a pack of five rats, their heads look to have exposed brain, and their glowing red eyes, focused on the group. the man sends a cone of ice at the creatures, frosting the area in glistening ice, then continues to run as the rats ignore the spell, squeeking angrily.

One of the walls of a nearby shop sports a large image of a woman's face, surrounded by knives and swords. A man is staring intently at the rusting metal sculpture, untill the dwarven man with him punches his gut, and warns him to stop obsessing over her, its either death or a maze if she notices.

Looking through your former portal, you realize that this is a shop, filled with cages, housing a variety of imps, fairies, and other small magical creatures, all in a sad state. Each cage has a price tag, and the friendly old woman at the counter, didn't even bat an eye when you appeared through her door as if by magic, but is now trying to sell you a crumbling earth mephit.

And, it looks to get worse, the farther up the street you look. How in the Hells do you get home? Do you want to go back?

Sitting on the steps of the shop, you hold your head in your hands, trying to recall the events leading up to your sudden transition through the portal...