Also, it's never Sekiro that get's brought up, with Sekiro having no Jolly Cooperation and likely being the most challenging of the Souls games.

There’s a reason it’s the only Fromsoft soulslike I haven’t beat. I’ve been stuck on one of the fights with the main antagonist with the lightning sword for months. And Sekiro doesn’t have a normal leveling system, so you can’t just grind and over level to get past.