The Tarin Circle of Moonglade Forest is led by 7 Main druids. They strive to not only keep the Moonglade safe from destruction, but they also strive to keep Brolin from being consumed by the wood. It’s a Symbiotic Relationship, helpful to all involved.
The Tarin Circle of the Daelen Wood consist of 15 druids and shamans, and charge themselves with the eastern half of the world, maintaining the natural beauty of the world. They work closely with the wood elves of the area. More xenophobic and anti civilization than their western counterparts, they are less friendly to outsiders, allowing only trade and contact with the elf clans.
There is also a Circle in the southern deserts, though they are a nomadic tribe, swearing off civilization, and impossible to find.