I'm looking for the name of a creature that latches onto a human and drains both their physical and spiritual energy, often transposing or swapping malidies with the person they have attached themselves to; so if the creature has a cut or an illness, they will "give it" to the person they have latched onto in exchange for that person's health, but if the person is sick themselves the two just end up swapping illnesses. While they mostly exist in the spiritual realm and have no definate physical form, they can take a humanlike physical form and often need to when a massive transfer of energy or healing is needed. A connection to one does not leave physical marks and the only real sign of such an attachment is the victims almost drug-like addition or desire for a certain item, location, or person.
I rememeber reading a story, from the time of the Black Death, about one years ago, but translator said it was only one of many stories that are centuries old.
~~ Abe
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