From the Deep Player's Guide

From the introduction:

Welcome to the Ophid Protectorate, one of the few true nations of the world of Ksaren, the world of the Third Dawn Campaign Setting. In the Ophid Protectorate, your psionic prowess determines your social standing and in this adventure path, you and the rest of your party will help to combat unknown forces disrupting psionic abilities within one of the cities of the Ophid Protectorate. From there, you will battle with abominations thought only a myth and encounter and interact with several of the unique cultures that call Ksaren home.