Arborea

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. Elves 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.

Optional Rule: Intense Yearning

Keep track of how many days a visitor spends on Arborea. When the visitor leaves, it must make a Charisma saving throw against a DC of 5, plus 1 for each day spent on the plane. On a failed save, the creature becomes afflicted with a yearning to return to Arborea. As long as the effect persists, the creature has disadvantage on ability checks. At the end of each long rest, the creature can repeat the saving throw, ending the effect on a success. A dispel evil and good spell removes this effect from the creature.

Type

Dimensional plane