Thuria and Beyond
Details/stats as per Deities and Demigods. The Cthulhu-worshipping Deep Ones live in undersea settlements on continental shelves around the world. While these creatures are far more numerous on the continental shelf of the Eastern Ocean, they do maintain settlements off the western coast of the great continent, mainly level with the Pictish Wilderness and the northernmost part of Zingara.
The Deep Ones were originally created as a servitor race by the aboleth of the Western Ocean, a result of genetic manipulation of primitive humans. The purpose of these amphibious creatures was to give the aboleth a presence on dry land – loyal emissaries able to move freely between the undersea cities of their masters and the plains and forests of the earth’s various continents. During the war with Cthulhu, however, the dreaded Green God of R’lyeh was able to bend the Deep Ones to his will, turning the amphibious humanoids against their creators.
Much later, the Deep Ones won influence over the ruling caste of the vanished empire of Acheron, offering access to powerful magic in exchange for a place at the heart of the affairs of the Empire.