A truly scary multiplayer gothic horror action RPG set in a Victorian world with a Lovecraft inspired story (already got the story written as it so happens) with multiple mutually exclusive but tightly linked story lines. That is to say you can experience only one part of the unfolding story with the player having to communicate and interact with others in the game world to discover the full horror of the world.

The world would not have instances the world would be in a state that players find it in, based on what other players had done.

I have a lot of the game mechanics thought out, but time and money... If only it were limitless...