Aerie of the Slave Lords - stuck in caves


New member
It's been ages since I've done this chain as I always found the earlier quests painful without any trapping. Got to last one now and started in the cave, found one person to rescue, but can't go any further because there's a blue barrier. I just can't find a way to disable it after a dozen laps of the cave.

Could some kind soul give me a clue please?