Beneath the Waves

From the back cover:
"Game Master's Workshop (GMW) is a series of source material designed for use with an role-playing system, including, but not limited to, Advanced Dungeons and Dragons and Hackmaster. Each volume of GMW contains valuable tools and aids to help make GMing easier and exciting for both you and your players. This edition of GMW is set in the popular Kingdoms of Kalamar Fantasy Campaign setting in Whimdol Bay on the southern shores of the Elos Desert. Howevr, he material is sufficiently generic so that the GameMaster can simply drop this material into his or her own campaign (if different from Kalamar) with virtually no alterations."