The Cave of the Moonsea Hags

Publisher's blurb: Travel to the Moonsea and defeat a Coven of Hags that are using their Cavern Whirlpool Cauldron and the bodies of sailors to summon a many-tentacled sea monstrosity. The Cave of the Moonsea Hags is a short adventure with a few path choices leading to varying encounters, culminating in one nasty boss fight. Set in the Moonsea region of Faerûn, but generic enough to be placed in any sea.