Colloquial Terms: The Black Dog, Haunter, Garm, Nighthound, Grim, Seamus, Harbinger, SEEKER
Physical Characteristics: Appears as a large black dog. The ears are pointed and the snout is elongated. The eyes appear as either black or red. Muscular body structure. Size changes, ranging from four feet (1.22 meters) tall to nearly ten feet (3 meters) tall.
Behavioral Characteristics: Often seeks out people with long kept secrets. Will bring its victim objects which somehow relate to that secret, goading them into revealing it. Has been observed to outright attack victims who do not reveal their secrets soon enough. Is occasionally seen working with other PREs, often acting as a herald and preparing the way for the PREs appearance. Has been known to sniff out secrets for PREs to use against their victims, either to destroy the victim's psyche or to manipulate the victim for the purposes of the Game.
Further Reading: This account of a man hunted by PRE10. See also the blog "Gaining Perspective"