Colour me interested.

I don't have much experience in fantasy games but the Stone Blight concept definitely captured my attention. As regards which time period the game should be set in, personally I would err against starting after the fall if only because I think there's a lot of storytelling potential to be found in terminal decline. Pre and post-collapse Vassidia will be wildly different places and by starting [i]prior[/i] to the kingdom falling, you allow for players to explore both.