Soundtracks for BG:EE, SoD, BG2:EE, IWD:EE, PST:EE are now available
in the Beamdog store.
FYI: You can re-enter the underdark in Chapter 6 SOA
A lot of on-line guides will tell you that once you're done with Chapter 5 you can't go back to the underdark. This is untrue. While you can't re-enter the underdark from the overworld map, You can still go back by going into the exit from the underdark area and walking back through the caves.