Trident Realm of Neritica
Deep beneath the seas of the known world lies the Trident Realm – a triumvirate of glittering underwater kingdoms, ruled by an aquatic race far beyond the ken of land-dwellers. Created during the God War by the Dark Smith, the Neriticans are as capricious as the vast oceans that surround them, in parts gentle and nurturing, in others spiteful and full of wrath.
As with many races, the fishmen’s influence on the world since has ebbed and flowed. They are fiercely territorial and have clashed and sided with many land dwelling peoples, especially when their watery domain is encroached upon by the vile, filthy cities that are built on coasts and rivers. Their relative isolation and remoteness has given them a certain aloofness to the general woes and conflicts of the other races, but when their anger is roused, few can stand in the way of the hordes that pour forth from the ocean waters.
– lore snippet from 3rd Ed. Rulebook