From the back cover:
...And you thought you knew everything about the good, old D&D® game world!
The Sea of Dread is home to not one, but several aquatic nations. There underneath the surface, lie mysterious caverns, submerged cities never explored by surface folk, shipwrecked remnants of historic naval battles, and countless frightening guardians of the deep. Discover the power of the kna, meet the kind people of smaar, and face the ultimate threat to the fabulous Realms of Undersea.
The Sea People is the third book in the Creature Crucible series that completes the Gazetteer line. It is also fully adaptable to the ADVANCED DUNGEONS & DRAGONS® 2nd Edition game.
The Sea People includes:
A complete description of the lands under the Sea of Dread, its people, and a large Gazetteer-style map of the submerged kingdoms;
Separate background and adventure booklets;
Complete rules on how to create and play Sea Elves, Tritons, Mermen, and other aquatic races;
New rules detailing underwater spell casting and magical items.
Don't miss PC1: Tall Tales of the Wee Folk or PC2: Top Ballista!