As part of your quest from Raphael, Kill Raphael’s Old Enemy, is to kill Yurgir, so he won’t approve of you saving the Fiend, and he won’t tell you what the marks on Astarion’s back mean ...

And a sequel, with Connelly reprising her role and facing Jareth in adulthood, could be an interesting thread to pull on. (Or not, given how Beetlejuice Beetlejuice tossed away its similarly ...