>>717117812
Challenging? ARPGs are loot piniatas games, so not a ton. Path of Exile 2 is pretty rough to play right now.
Grim Dawn is fairly difficult depending on your build.

Book of Demon is a Card based ARPG? that is supposed to be hard
https://store.steampowered.com/app/449960/Book_of_Demons/

I would recommend Grim Dawn if you want a step up in difficulty