The original pitch for Diablo (1994) [pdf]
I'd really enjoy seeing a modern ARPG that is legitimately unsettling and dark in the way that Diablo was (and D2, to a slightly lesser extent). We've got D3, which has really fun gameplay but feels commercialized and looks like WoW, and we've got PoE, which has a lot of really brilliant ideas and has a darker theme but at no point is ever actually unsettling.