Arborea or more fully, the Olympian Glades of Arborea, is a chaotic good-aligned plane of existence. Arborea is stylised as a peaceful plane of natural beauty with a multitude of thriving environments. Much of the plane is dominated by vast tall forests, but also includes glades of wildflowers and fields of grain. As a plane that also embodies chaos, it has a wild and often sudden nature. The weather can change drastically at short notice, changing from warm sunshine to raging winds and back again in just a few minutes.

Principally, it is the home plane of the Seldarine, the good Elven deities, headed by Corellon Larethian. The actual realm of Olympus is found here, and is home to many deities of the Greek pantheon

Polyphemus the Titan was imprisoned on Carceri by the Greek gods, along with the other Titans, eons ago. His manor was recently discovered by planeswalkers, in the wilderness near the town of Poykeptolos on the Olympian layer of Arborea. It is about 2 days walk from town, first on the road past the realm of Apollo, and then through the wilderness for a day, after turning at a temple with statues of Ares and Athena in front of it. It is located in a green canyon over the northern slope.

Team Pelor was sent by Perry to recover what treasure they could from the manor to aid in the war on the Black Lotus. The Team unwittingly freed Polyphemus, and fled when he returned home and asked them to return the loot that they had stolen, earning his emnity.