I’m losing my mind. Please help. (Underdark + Grimforge)

I’ve been searching Google and Reddit and the Wiki high and low and can’t get an easy answer. Please, I’m losing my mind down here and I just want to take the elevator to the surface, but I have to release Nere from the cave in first. But everything I try starts a fight and doesn’t destroy the rocks.

I see I’m supposed to go find a “blue female” in a cave somewhere down here that will give me an explosive vial of some sort? Can someone give me a more direct route to this cave, and maybe the name of the female? Also specific instinct on how to destroy the cave in, that have worked for you personally?

I don’t care if there’s spoilers. I don’t care if this is considered cheating. If I have to spend one more hour in the Underdark before reaching the surface I’m going to rage quit 😭 And no, I don’t want to just fast travel back to the Act 1 surface and go through the pass…I’ve already made it this far. I just need that damned lantern then I can take the elevator!