On my 2nd playthough and in Heiberheim there is a boss monster called "The Guardian" that takes way too long to kill. My characters were level 15 (normally your suppose to be 11-12 at this point, but I went to find another way to get into Heiberheim without killing the mushrooms... ended up killing the mushrooms at level 15).
The monster was taking damage from each hit between 5-12. There is no reason for this battle, other then proving a game developer can easily make a boss battle to just piss off the gamer. It took me almost 40 minutes to kill off, I couldn't believe how long it took until I looked at my watch.
One of the big problems was that it liked to walk all over Heiberheim as you fought it.