[@WXer], Sounds like what Wikipedia says about Deadlands. I like it, although I'd like to add that: 

1.) Only the Keyblade can destroy Heartless permanently; other weapons just destroy the Heartless' body but allow it to reform and regenerate elsewhere.

2.) Heartless would be appearing [i]everywhere[/i] on the Dark West's Earth; no amount of blockade or trade embargo will prevent that. So Europe will be facing troubles by then.

Other than that; I like it.