Nightreign is either the easiest or the hardest Soulsborne game to platinum lol. If you have friends who play and can consistently play with a proper team, or even if you can solo some bosses, it's one of the easiest, the one exception, depending on your playstyle, is defeating the last boss with every Nightfarer, some of them, like Recluse are really hard to play properly if you're used to the Unga Bunga playstyle.
Playing with randoms can make this one of the hardest plats ever lol, from failed runs to people who ignore (or just don't know how they work) the shifting earth stuff, some bosses are also way harder with multiple people since it makes it super hard to keep track of their attacks.
Thankfully you don't need to beat any of the Everdark bosses, those are a huge pain.