Possession
Remember how Devils can't survive for long in our world? That's why Shells exist. But sometimes, there isn't a convenient one available. Then they have to use more ancient methods.
Sometimes, a Devil doesn't have a Shell built for it. Sometimes, it's Shell is destroyed. And sometimes, they need to be a little more...subtle.
Infernal Possession is difficult to root out at the best of times, as Devils are accomplished liars, and the act of possession itself gives it access to the victim's memories.
Transmission & Vectors
Direct contact with a Devil's spirit.
Symptoms
Suppression of the conscious will, and submission of the body to the Devil's will. Significant increase in mental and physical stamina.
Treatment
A devil can be exorcised by a Binder, if the subject is known to be possessed.
Prognosis
Eventually, a human body and mind will snap under the strain of harbouring an Infernal presence.
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