Here is my vision of a Dybbuk, a malicious or sometimes malevolent possessing spirit from Jewish folklore. Their name comes from the Hebrew word "דיבוק", meaning "attachment", and they can be exorcised and sealed into boxes, cabinets, etc... Sometimes they're the disembodied spirits of dead people which escaped from Gehenna or were refused to access it, thus wandering the Earth, and other times they're evil entities that never were human before.