The second module in the D series, in which players explore the underdark, this module introduces us to a couple of iconic D&D races, one of them is right there in the title, the Kuo-Toa, Lovecraftian fish-people and their goddess Blibdoolpoolp (hence Sea Mother, because I can’t be bothered writing that again). In fact the climax of this module is the titular Kuo-Toan shrine to the Sea Mother.

Before that, however, you get to meet the Svirfneblin (hence Deep Gnomes, because again I can’t be bothered typing that out, or pronouncing it in my head), a overall neutral to good race which can become valuable allies to the party as they go down deeper into the underdark. It’s also convenient that they hate Drow, Kuo-Toa and Illithids, all the enemies that the party has to face down here. 

It would, however, be a mistake to go through this module swords blazing, there is a lot of interesting politics, religion and social structure to the Kuo-Toa that would be lost in a hack and slash approach. There are chances for some great role playing here, particularly if the characters impersonate pilgrims to the shrine of the Sea Mother where they might even be teleported to the Elemental Plane of Water and get to meet her with some dangerous but cool consequences. This is a pretty nifty module which can be good or great depending on the approach taken by the party.