The original race that existed in Kethryn, they were created and blessed by Linniah. They look quite sililar to scaled humans and sported spines along their spine, the back of their calf and on the back of their forearm.
The Mishtai sought perfection of form in all aspects and were the original peacekeepers and empire builders on Kethryn. When the division into the Rilken and the Skarn occurred the empire began to fall. Usually this creates a powervacuumm, but along with the fall of the Mishtai Incarnum was also removed from the world. The world was too beaten down by this to fill the power void.
People struggled to rebuild their lives afterwards and even after 2000 years there has yet to be a serious effort at rebuilding the empire.