Tulpamancy

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Tulpamancy is the art of purposefully creating headmates through various techniques. A headmate created in this way is called a "tulpa". A tulpamancer is a practitioner of tulpamancy.

Related Terms
Parogenic is a related concept, but the term may be avoided by some systems in favor of tulpamancy/tulpagenic or tuplamancy/tuplagenic. Similarly, tulpamancy/tulpagenic or tuplamancy/tuplagenic may be avoided by some systems in favor of parogenic.

History
The term tulpa in its modern usage first appeared in the book Magic and Mystery in Tibet (1929) by the Theosophist Alexandra David-Néel and based on the Tibetan word sprulpa, which approximately means emanation or manifestation. Tulpamancy was popularized and secularized on 4chan and Reddit beginning in 2009.