Athel Loren is the most magical forest, and the polity within it it an alliance between Elves who split off from Ulthuan ages ago called the Asrai, and the Elders who lead the forest spirits of Athel Loren. Those Elders began as three, but Adanhu died and Coeddil went crazy and was sent to Tree Jail, so there's just Durthu left. Drycha is a follower of Coeddil and wants to wipe out the Asrai, and so is not really aligned with Athel Loren as a polity.
There are also the Eonir, the Elves of Laurelorn, which is a forest less magical than Athel Loren but still pretty magical. The Grey Lords have bound the forest spirits of Laurelorn to the service of the Eonir.