Tsol'aa were the first race of intelligent beings and created by Ayar-now-Sarapis. Their homeland is in the redwoods of the Aalen Forest by the Western Ocean, where many of them still live peacefully in their treetop homes. Slender and graceful, their natural lives can span a thousand years.
During the War of Humanity, the God Daedalus brought Tsol'aa warriors known as the Qui'anar, mounted upon great spiders, to battle against the forces of the Triumvirate. During this war, however, the Tsol'aa who fought became corrupted by the killing and afterwards began to lust for power. The newly born human race, they argued, could easily be made to serve the Tsol'aa. This power-hungry group of Tsol'aa began calling themselves the Tsol'teth. They left their racial homeland and settled in the Underrealm, enslaving many of the weaker goblinoid races and setting themselves up as fearsome overseers of the violent underground cultures of Sapience. Much later, they were to reappear in the Black Wave.
With the Tsol'teth gone, the remaining Tsol'aa split into two further groups. One elected to remain in their homeland and continue living in the traditional way, studying and furthering their knowledge of both magic and nature. Another, the group that came to be known as the Tsol'dasi, decided that they did not care to be involved in mortal affairs any longer and left for parts unknown. Members of the Tsol'dasi have rarely been seen since.