There's something about Zelda games that's just completely engrossing. Whenever I play one, it's on my mind until I finish it up. The Souls games live in that same mental space for me and engage me very similarly. They're not totally similar, but something about that third party action style in a world that's unfolding as you progress makes both of them resonate extremely well with me.
Also, I have incredible nostalgia for Zelda. I've been playing it literally my entire life. The first game I loved was Zelda 1 on the NES and I've beaten that game more times than I can remember. I played it straight up until I got A Link to the Past, and I played that straight until I got Ocarina of Time, so on and so forth. At this point I'm so vested in that universe that it just tops anything else almost by default.


