there really interesting games. i didn't know much about them besides there like a medieval game (kinda like zelda game play wise but much much harder) got a switch lite a few days ago and picked up diablo 3 and dark souls for itI can't say I've heard of Dark Souls.
there know for being brutally challenging but fair at the same time. there are quite a few of them. the games i know which are like dark-souls (made by the same maker)
demon souls (which was a ps3 exclusive) dark souls 1-3, bloodborne (ps4 exclusive) and sekiro: shadows die twice.