Easily my favorite genre of game in the modern era are the Sous-like games. Starting with the fantastic and soon to be remastered Dark Souls and spun off with fantastic takes like Salt & Sanctuary and Ni-Oh. The base formula is simple, you are dropped into a world that does not hold your hand and tasked with fighting enemies that can often kill you with relative ease.
The back and forth of fighting for your life with the constant threat of losing progression makes the player always feel like there is something on the line. That game play loop has become one of my favorite experiences in video games.