Why don't we just set it either in the future (DSII) of Dark Souls (but still in Lordran) or in the past of Dark Souls- the rise of the abyss and the fall of Oolacile, maybe, or even before that. Hell, we could start from the time of the Everlasting Dragons, and see how that turns out. It could be pretty cool to RP as giants, but it might annoy those who put a lot of effort into their character sheets...