Planescape Canonical Campaign
Larger than life, Arborea is a place of violent moods and deep affections, of whim backed by steel, and of passions that blaze brightly until they burn out. Its good-natured inhabitants are dedicated to fighting evil, but their reckless emotions sometimes break free with devastating consequences. Rage is as common and as honored as joy in Arborea. There the mountains and forests are extravagantly massive and beautiful, and every glade and stream is inhabited by nature spirits that brook no infringement. Travelers must tread lightly.
Arborea is home to many elves and elven deities. Elve born on this plane have the celestial type and are wild at heart, ready to battle evil in a heartbeat. Otherwise, they look and behave like normal elves.