1st Pandaeomonium-because of all strong resistant enemies
2nd Dusk Chateau- vampires sad and other enemies don’t get much gold and are pretty strong
3rd-haven’t played in a while, but some of these post gnoll levels, it spawns enemies near the exit, plus you don’t get much gold plus BLOOD GNOLLS
Vengeance -haven’t played but everything seems easy
LoKR- Fighting Iriza with not enough splash damage and whole the rotten forest campaign