# Introduction Mitama is the study and classification of Spirits and Undead. It is a scientific application of [[The Shuangdao]] Spirits and Undead (collectively referred to as Mitama) exist as reverberations and disturbances that exist in the [[Wuji]]. They have varying levels of consciousness and free will. Mitama may become attached to other living beings, forming relationships with them. Mitama that have a symbiotic relationship are known as Familiars. Mitama that develop a parasitic relationship are known as Poltergeists.