You have no idea where you are. You have no clue how or when you even got here. There is a grassy field that seems to extend forever, you can't quite tell how far it goes due to a strange blue mist that permeates the air. But that's not only thing strange about the field, there's also the fact that it is perfectly flat, with grass that looks as if it were cut evenly to the nano-meter. The lack of any clippings whatsoever suggests that it's always been this way.
You quickly noticed the moment you opened your eyes that you weren't alone. Thousands of people are also in this field with no one knowing what has happened to them. There are strange people all around, people you'd never have seen where you're from. Behind you is what should be an impossibility, a stone wall that extends so far up that it has passed the heavens. The wall's surface is unremarkable except for one thing at the base, a cave entrance.
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So this is Blue Fog, a survival RP. The player goals will be to survive and attempt to form some semblance of a functional society, and maybe figure out why they're here. But there is nothing in the field, and anyone that tries to venture into the fog always ends up back at the wall. The only option is to venture into the cave and hope to find what they need. But only a few people out of the ten thousand will be able to enter the cave, all others are repelled by an invisible force.
The only ones that can enter are those that have a symbol on the back of their left hand. This symbol will represent that character's given class, as everyone's is different. Because you see, people from many different universes found themselves here. One person might be an elf, another could be an alien. Those with a mark will each find themselves to have a 'gift.' A player's gift will be a unique power or trait such as pyromancy or enhanced strength.
The cave will effectively be like a video game dungeon, with multiple levels filled with all sorts of monsters (I'll be making a bestiary as new monsters are discovered) and on certain floors there will be treasure, usually something that will help them survive on the surface. Accomplishing certain goals will yield rewards as well.
So, who's interested? If you have any questions feel free to ask me.