Introduction
This premise is based on the setting explained in this D&D podcast episode Dice Funk S3: Part 1 - Crab Day(youtube.com/watch?v=UKBtHvJZYIM), i’ll summarize for us:

It's my first time setting one of these up but I thought it would be good to do to get the ball rolling for our group. To start you need to have a written character background with a basic bullet point character sheet, for other players to be able to reference. Once you've done that feel free to post and start your narrative and we can figure out the details of this as we go.

Premise:The Cursed City
Once they enter no one can leave the boundary of the cursed city. It is known throughout the world as a mystery, a marvel that has cost many a curious magician and explorer… or at least people assume it cost them, no one actually knows since they are never seen again to tell. No one knows what goes on inside, how big it is, or how many people are trapped there, from the outside all that can be seen is the murky silhouettes of people and buildings through an ethereal wall that reaches all the way up to the sky.

Despite this many still willingly enter, the last of magical or strange races hoping for refuge, researches and sorcerers hoping to discover its mysteries, crooks running from consequence and occasionally, the foolhardy optimist hoping for a new chance and adventure.



Settings:
Inside the city can be as many kinds of environments as our story requires, city, rural or town. It’s set in a typical fantasy kind of world so magic stories, creatures and races such as elfs, dwarfs, dragonkin and so on are possible.

Your Characters:
This is a typical fantasy setting so most humanoid(and possibly not if you want) creatures are on the table. Beyond that the only thing your backstory really NEEDS to have is how or why they ended up in the cursed city, their motivation or circumstance.

In you character description please think about;
Race
Age
Temperament/Personality
Appearance
Pros
Cons
Fun Details(Like hobbies or quirks)
Other(Things that may have not fit in the backstory you want to add for flourish before stating)

Narrative:
The story motivation I think can be left simply to emerge from why your character chose(or didn’t) to enter the city. What lead them there and what were they hoping for, revenge, to get away from something to find something? From that and how they find and then interact with others characters narratives should be enough I think to start with.