The concept of tulpas originated in Tibet
by magicians and monks
supposedly with your mind and your imagination
you could create real beings
separate from you with thoughts and astral
lives of their own
practitioners of the occult did the same, except
they called them thought-forms
I once read of a black magic magician who
called them familiars
and according to what I read on a Buddhist site,
quoted below
tulpas and thought forms sometimes run away.
Bob Boyd
“Once the tulpa is endowed with enough vitality to be capable of playing the part of a real being, it tends to free itself from its maker’s control . . . . Tibetan magicians also relate cases in which the tulpa is sent to fulfill a mission, but does not come back and pursues its peregrinations as a half-conscious, dangerously mischievous puppet.
The same thing, it is said, may happen when the maker of the tulpa dies before having dissolved it.”
Source