About Planes (Endhaven Supplement)
From D&D Wiki
 Olyptia's Cosmology
Olyptia is broken into four planes: Material, Incorpreal, Luminescent Empyream, and the Hollow Dark.
Material: The Material plane is where the Olyptian continent actually exists and where all living things exist. This realm experiences all the normal changes of other realms of existance.
Incorpreal: The Incorpreal plane is where the restless spirits of deceased Olyptians exist and from where most necromancy draws its power. Also known as the plane of the dead.
Luminescent Empyream: The Luminescent Empyream is the plane of existance where the righteous and the innocent go when they die if they are not trapped on the Incorpreal plane. Also the plane of the Celestials.
Hollow Dark: The Hollow Dark is the plance of existance where the overly wicked go when they die if they are not trapped on the incorpreal plance. Also the plane of the Fiends.
Spirit: This plane is inaccessible to all living or dead beings. This plane is where all magic exists at once and is what is called upon my the various magic users, exlcuding necromancers except in the aspect of their familiar.