You might also enjoy Climbey (http://store.steampowered.com/app/520010/ ) - it doesn't look particularly physical at first but it uses a decent amount of slow muscle movement. I was surprised at how sore I was the morning after a long play session with it.
(Oh, and given you love Dark Souls - you have heard of Left-Hand Path ( http://store.steampowered.com/app/488760 ), which keeps getting described by users as "Dark Souls VR", right? If not, I seriously need to work on my marketing. It's also at least somewhat physical, particularly if you decide to use the dodging mechanics a lot. Full disclosure: I'm the developer of that one.)