Tulpamancy

undefined: Tulpamancy is the art of purposefully creating headmates through various techniques. A headmate created in this way is called a tulpa.

Related Terms
Some systems that form this way prefer the term parogenic and refer to their headmates as parogens.

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 popularised and secularized on 4chan and Reddit beginning in 2009.