>>528043302
I am pretty sure that Gale claims it's the Orb and or Mystra?
Shart was part of a team. Her levels varies because of the mindwipes(Applies for Durge too). She never mentions being more powerful than she is.
Karlach never gives and excuse for her weakness. Bad writing. The devil engine not working outside of the hells would be a good excuse but then you couldn't have the overheating plot.
Astarion never mentions being weaker although he is a 200 year old vampire and his mates are all level 11 or something.
Wyll claims that it's the tadpole but that is stupid because no one else says that or seem worried that they have become weaker because they were tadpoled. Other true souls make it a point of becoming more powerful and minthara seems to have kept her levels. It would make more sense if Mizora was fucking with him for the lolz.
Jaheira is ridiculously underleveled for a 200 yo adventurer and leader of the fucking harpers and no one bats an eye. Minsc is more powerful than her and he was petrified for 100 years.

Generally the levels are what they are because of convenience and Larian didn't bother to explain shit properly because they don't care enough to.