Thoughtform
A thoughtform is the general term for a mental construct treated as an entity — tulpas are the deliberate kind, egregores the collective kind, and the accidental kind is what this archive mostly sees: a fear given a name during a bad year, which then started leaving evidence. Theosophy coined the vocabulary; psychology reads the same reports as externalized inner life. The filed accounts hinge on the moment of independence — the imagined thing knowing something its imaginer did not — and juries treat that claim exactly as sternly as you would hope.
Related on this site: /tag/imaginary-friend/ /tag/unexplained-events/ /random/