It's frustrating when you buy an adventure that's supposed to be "mega challenging" for 6-8 "seasoned" players and it's a cakewalk for 7 teenagers new to the game.
Admittedly, they have a little bit of magic items over what they should - but believe it or not, it's actually in keeping with the rest of what Necropolis is handing out to the characters: +1 swords, +2 armor, rings of protection, wands of lightning bolt, etc., some of these early encounters. And yeah, I didn't know a subtle rules thing that impacted a metamagic casting of Fireball that changed one combat.
But my lord, is it difficult to challenge a group in 5e! Especially when the adventure isn't written to take advantage of multiple encounters in a day. And there's no setup to encounters or advantageous terrain for fights.
Honestly, what am I paying for?