I'm not sure how much support you'll get with this; I've put forth a Dark Souls rp myself several times and there were never enough (and consistent enough)) people for it to work out. That said, I can help and probably co-gm; I'm REALLY familiar with this game. I've been involved in the Souls Series (now Fextralife) forums for several years and am very intimately familiar with this game, and I have run a game in the Advanced section of this forum before (though it got cut off when the site went down).

I note that the different occult factions weren't necessarily connected, though; with how the lore is stated, there very well may have been multiple, entirely disjointed groups that just made similar moves at similar times-like how Rome was assaulted on multiple fronts from all over the empire, though it was not an intentional collaborative effort.

Also-I'm in agreement (and am actually much more strong in my opinion than you seem to be) regarding Dark 1 being a better game than Dark 2.

I was actually about to run a Dark Souls rp on Fextralife, actually (by [i]request, even[/i]-everyone has stopped posting, though. If you're interested in looking at it, read [url=http://www.fextralife.com/forums/t28449/nodiatus-dark-souls-roleplay/]the first post[/ur]-the rest was all mechanics (it was going to be a tabletop-ish game; I can easily drop that, though).