Warren

All arcane spell casters draw and manipulate arcane magic from The Planar Weave, which is often thought of as the leftover energies of creation. The Planar Weave connects to all planes and is a reliable source of power. Some casters, however, chose to specialize in drawing the arcane energies from specific planes themselves. Such casters and their magic take on special powers from their chosen plane and gain access to new spells. The Planar Weave that surrounds and emanates from a specific plane is called that plane's Elder Warren. The incomprehensible maelstrom of Planar Weave that emanates from each plane's Elder Warren is heavily filtered and focused by the methods used by the caster to control it. These methods are referred to as warrens, or sometimes "planar schools." Warrens are as much schools of magic as they are a separate and distinct kind of energy. Consequently, many (perhaps infinite) warrens could all share the same Elder Warren.