A few encounters that were rough on the PCs. I had to fudge some dice rolls or the party requires a Sorcerer/Wizard and burning hands.
20 Kobolds. Action economy can overwhelm PCs even if Kobolds suck theres a large amount of them.
Similar to area 6. 15 Goblins, a group initiatve with the Goblins winning can be very brutal. Even without that its still 15 goblins who are nasty if they use alot of missile wepaons.
These hobgoblins react. 10 hobgoblins+ a leader type all ending up in the same room is a bit much even for level 2 PCs. Was a TPK but I fudged some dice rolls.