The Prime Material Plane is the plane with which most adventurers are familiar. It is the normative plane of existence upon which resides the planet of Achaea, as well as the sun, the moon, the former celestial triad of Noxtra, Somnustra, and Lunastra, the comet Ethian, and many other planets, stars, masses, and energies. Certain abilities may only be used upon the Prime Material Plane.