I really enjoyed the knowledge crystal boss battles in the crucible, it was very enjoyable, and also farming back for my Storm's Grandmaster gear back when level 50 was the cap seemed tedious at first, but it was so rewarding when I got it
The Malistaire fight was, by far, the most memorable. I still have 2 wizards on my main account who have yet to face him, one of whom is already in Dragonspyre, and I'm as psyched as I was the first time. Somehow, it just never gets old.
