From publisher blurb:
Plunder the secrets of the drowned city of Ker-Is, sunk beneath the waves ages ago, now inhabited by the friendly triton people, but ruled over by the tyrannical sahuagin Empire of Dagon! From the remote lands of the coast where sahuagin vanguards strike at the feuding swamp clans, seeking to establish a foothold on dry (ish) land from which to sack cities and eradicate potential rivals, push the sahuagin back into the littoral frontier where you will have to make peace between the koalinth, merfolk, and sea elves to sack sahuagin guard posts, fight pirates both drowned and regular, and defeat storm wizards and lurking dragons to secure the waters of the surface, and then push them back further to the drowned city of Ker-Is, an ancient surface city that sank into the ocean millennia ago and become the capital of the tritons, and then of the sahuagin when the Empire of Dagon came to power.
Don bathypelagic armor and descend to the deepest unlit trenches of the ocean to enlist the aid of the deep ones and lead a triton resistance to break the power of the sahuagin in Ker-Is before pursuing them into the Elemental Plane of Water where, amidst the marid emirs and the storm and frost giants of the Ordning, you may break their power once and for all, freeing the creatures of the sea from the tyrannical grasp of the Sahuagin High Priestess and her aquatic legions!
Take up the fight underwater with new sub-classes like the Barbarian Champion of the Sea, whose rages channel the powers of the octopus, crab, dolphin, or the mighty blue whale, or the Pearl Knight, who specializes in fighting underwater while wearing pearl armor, heavy armor that doesn't make you sink like a stone.
On the GM's side, confront your players with the full wrath of the Empire of Dagon with complete stat blocks for all the many forces arrayed under the banner of the Sahuagin High Priestess, built in patrols and detachments that use combined arms tactics so that you can confront your players with two dozen enemies and they will have dedicated melee and ranged units and an officer and a spellcaster and otherwise have interesting unit diversity rather than being the exact same guy sahuagin warrior copy/pasted twenty-five times with one boss monster tossed in.
The Traveler's Guide series uses and contributes to the Creative Commons Weskven setting, a high fantasy adventure setting free for anyone to use, including commercially, so supporting this project will help bring that setting one step closer to completion and shake just a little bit the grip of corporations hoarding all of human storytelling like dragons.
Back open gaming and plunder the depths by supporting the Traveler's Guide to the Drowned City of Ker-Is!