I have to ask, what are the kua-toa and where are they? I've explored the underdark in two playthroughs and never seen them.
They’re very easy to miss, as you need to jump down some rocks and climb down a crag to get to their cove. It’s not far from the entrance to the Arcane Tower courtyard: if you keep that to your right and start heading along the path towards the jump up to Ethel’s lair you should come across the right place. There are some torchstalks and a skeleton with a helm that gives a bonus to wisdom saving throws near where you need to climb down.
