I'm frequently underwhelmed by really tough boss fights that reward xp way less than they should. You know what I'm talking about, like that source abomination crab. 900xp, 900... 900... seriously? I get more xp from killing a skeleton that takes 1/20th the amount of time it took to take that bad boy down. The orc shamans outside of the cave were giving more lol. Not fun. This is about the same with braccus rex and stuff too, shit damn hard boss battles and you get no xp.