Before the release of Sekiro: Shadows Die Twice, tell us which Souls-like game gave you the most challenge?

I've only seen my little brother play Dark Souls once... kind of regretted letting him play it since he just kept falling off of a bridge cause it was funny to him XD It was a library rental so I didn't get to play it long (or at all for some weird reason)

I've only ever played DS3 tbh. I think I got it 75% off and I wanted to try a Souls game since I heard that despite the challenge they were pretty fun and good games. I haven't played much tho and I remember getting stuck at the bonfire for far longer than I should have been because I THOUGHT I had talked to everyone but the game thought otherwise lol

DS3 the only one I've played, was great fun. And frustrating, but it got easier.