Spirit: spirits are beings that are the embodiment of an energy. Though they are insubstantial and invisible, they have incredible influence on the mortal realm. Every spirit is unique in form when seen, usually in places where spirit energy is strongest. Shem exists within the Spirit Realm, but on the edge, so the spirits only manifest on the other side of the Spirit Gate, deep within Shem.

There are many ways to wield spirit energy:

Spirituality, gaining the favor of spirits through faith
Spiritcasting, commanding spirits through magical ritual
Spiritism, communing with spirits through meditative arts
Spiritology, studying spirits and using knowledge of them to manipulate them
Spirit Dolls, trapping spirits in objects and using those to command their power
Spiritspeaking, communicating with spirits