Or whatever the word is, you know what I mean. I've always kind of dabbled in them off and on, then recently I finally "got" it with Dark Souls Remastered. Put 50 hours into it and beat it and damn those things can suck you in. I'm halfway or 2/3 through 3 now, and after that I'm thinking I'll go back to 2. Then probably Bloodborne. Can't wait for Shadows Die Twice.
Anyway, thoughts on the following, and others?
Dark Souls 1 - Best Game in the "Dark and Bloodborne" series, and one of the best games ever created. Has maybe the best DLC ever created. Tough choice between the DLC for this and Bloodborne.
2 - Gets a bad rap because it's the worst Souls game. Still better than 97% of the garbage released last gen. Solid game.
3 - Second best in Dark Souls series. Very close to being as good as part 1.
Bloodborne - Bloodborne is nearly a perfect game. The theme and art direction is on point. Gameplay is fast, technical, and requires skill. The only single gripe I have with Bloodborne is the limited choice of weapons, which leads to restrictions in the variety of builds you can use. So instead of playing it a few thousand hours, and never running out of builds; you may play a few hundred and feel done. Also I guess there's a second gripe. The PVP blows. This might not matter much to you.
Also, some people may be turned off by the difficulty. At first the game can be quite a challenge, but after your build starts coming together it gets easier. Bloodborne is fucking awesome. Play it!
Nioh - Just finished this a few weeks ago. Nioh is a very solid game, and one worth holding on to. The story and world building is not as strong as the Souls and Bloodborne games, HOWEVER, and this is a big however. The combat is so tight, and feels great. Lots of build options, and really just a wonderful experience with exception of the story. The story isn't that bad though, sometimes it's just a bit much. That combat though... hard for me to say, as Souls is my favorite series of all-time, Nioh has better combat. Like Bloodborne though, even to a higher degree, starting out is super rough. This game is brutal at first. Nioh is also a must play.
Demon's Souls... You forgot this one. Best game out of the entire series. Best atmosphere, coolest weapons, tons of build options. The bosses are a bit lacking, but still very cool. Not on an epic level like Orenstein and Smough, but have unique ways to beat them. Demon's Souls is probably my favorite game of all-time. Too bad for you the servers shut down a few months back. When it first came out, Demons Souls online captured some of my fondest gaming memories. PVP was great, co-op was a ton of fun... it was a beautiful game in its prime. Too bad most people missed it. Here's hoping the synchronized server shutdown in the USA, Japan, and Europe were part of a bigger plan to remaster the game.
I'd play in this order.
1. Dark Souls 1 - Since you already beat it
2. Demon's Souls
3. Nioh
4. Dark Souls 2 (Don't play this last, save a good game for last)
5. Dark Souls 3 or Bloodborne