I know I'm not exactly posting much at the moment, but I said I'd write this up here this evening, so here goes ...
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There is an island that does not appear on any nautical charts, far removed from the closest shipping lanes. Quite a lot of money and influence has been expended to ensure that this continues to be the case. Rumours of it occasionally surface, on conspiracy theory forums, and soon drift back down where other long forgotten things go.
Amongst a .. certain level .. of society, there is a little more solid information, but it is such that is only discussed quietly, with those one trusts. Yes, the island is real. Yes, all you've heard is true. An invitation? Well, that takes a lot more doing. Money changes hands, favours are bargained, and perhaps .. just perhaps .. the Master of the island will extend an invitation.
The island is a retreat, of sorts. It is a place where the rules and conventions of society do not apply, and the only laws are those of the Master of the island.
His seat of power is too much to be called simply a mansion. Castle is a better fitting word. Much of the rest of the island is wilderness, which is as is intended, for this island is for those who enjoy to hunt ... the thrill of the chase .. the fear scent of the prey hanging in the air .. their laboured breathing as they are finally cornered .. and then, to the victor the spoils of the hunt.
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As you've probably gathered, it's not beasts being hunted, but people, and I'm sure the spoils can be figured out equally easily. I envision the game as capable of running the gamut of threads from consensual (the staff of the mansion are only too pleased to be of service, and the mansion contains fully equiped play rooms, hot tubs, bedrooms and so forth for the comfort of the guests), through to NC (the hunters and hunted, running around in the wilderness outside the castle), and possibly further.
For a genre, I'm leaning towards urban fantasy, as this allows for the likes of vampires and werewolves amongst the hunters, and more exotic prey as well (nekos would probably be fairly popular). How challanging of a prey a hunter wants could be worked out between whoever was wanting to take part.
A pool of hunters and prey would allow people to match up with someone compatable, and then each hunt could spin off into its own thread from there.
Prey would generally be taken from the outside world, possibly taken to order for a particular hunters preferences. Part of the Masters price of admission is favours and his web is spun wide indeed. After all .. he's been doing this for a long, long time. A few keystrokes in the right place, and a person can vanish. A terrible car accident, and the prey is rushed off in an ambulance, and then ... vanishes. They wake to find themselves elsewhere.
So ... anyone interested?