all of the Tungusic idioms" such as Negidal, Lamut, Udehe/Orochi, Nanai, Ilcha, Orok, Manchu and Ulcha, and "nothing seems to contradict the assumption that the meaning 'shaman' also derives from Proto-Tungusic" and may have roots that extend back in time at least two millennia. The term was introduced to the west after Russian forces conquered the shamanistic Khanate of Kazan in 1552. The term "shamanism" was first applied by Western anthropologists as outside observers of the ancient religion of the Turks and Mongols, as well as those of the neighbouring Tungusic- and Samoyedic-speaking peoples. Upon observing more religious traditions around the world, some Western anthropologists began to also use the term in a very broad sense. The term was used to describe unrelated magicoreligious practices found within the ethnic religions of other parts of Asia, Africa, Australasia and even completely unrelated parts of the Americas, as they believed these practices to be similar to one another. While the term has been incorrectly applied by cultural outsiders to many Indigenous spiritual practices, the words “shaman” and “shamanism” do not accurately describe the variety and complexity that is Indigenous spirituality. Each nation and tribe has its own way of life, and uses terms in their own languages. Mircea Eliade writes, "A first definition of this complex phenomenon, and perhaps the least hazardous, will be: shamanism = 'technique of religious ecstasy'." Shamanism encompasses the premise that shamans are intermediaries or messengers between the human world and the spirit worlds. Shamans are said to treat ailments and illnesses by mending the soul. Alleviating traumas affecting the soul or spirit are believed to restore the physical body of the individual to balance and wholeness. Shamans also claim to enter supernatural realms or dimensions to obtain solutions to problems afflicting the community. Shamans claim to visit other worlds or dimensions to bring guidance to misguided souls and to ameliorate illnesses of the human soul caused by foreign elements. Shamans operate primarily within the spiritual world, which, they believe, in turn affects the human world. The restoration of balance is said to result in the elimination of the ailment. Criticism of the term The anthropologist Alice Kehoe criticizes the term "shaman" in her book Shamans and Religion: An Anthropological Exploration in Critical Thinking. Part of this criticism involves the notion of cultural appropriation. This includes criticism of New Age and modern Western forms of shamanism, which, according