An excerpt from Magic in Flesh: A Study in Earthly Manifestation by John Fogg:
“The Tersus (from the Latin for “clean”) is a carnivorous creature that in its original form resembles a tangled mass of tentacles that entwine around a tiny void that acts as its stomach. It originates from a small quadrant known as Kushner’s Cove, a pungent area colloquially described as ‘the armpit,’ ‘the ballsack,’ or ‘the Florida’ of the Yoros Dimension.
“However, the Tersus derives its name from its behaviors, rather than its habitat. Although the timeline is murky as the waters of the swamp where it resides, we know that in very recent times the Tersus somehow gained access to a regional television station known as ‘Memorable Television’ (MeTV), possibly by picking it up via aerial signal. It was from what it saw through these signals — primarily sitcoms from the 1950s and 1960s — that it developed its sense of how humans in our dimension function.
“Based on these minimal observations, the Tersus has developed a form of camouflage that it deploys when hunting its favorite form of food: Humans. Similar to an Oblex (see p. 194: ‘Fictional adaptations of real magical creatures’) a Tersus assumes the form of whatever it eats, and the human form is possibly the most practical, or even comfortable, for it to inhabit due to humans’ size and adaptability. By appearing human, the Tersus also gains the benefit of human’s social nature, which allows it to continue coming into contact with others, essentially providing it a literal buffet. Although a Tersus can only occupy one human form at a time, it can remain in a single person’s form for up to three weeks before getting hungry again.
“How can you tell if you’re in the presence of a Tersus? Because its knowledge of its prey is limited to television programs such as The Andy Griffith Show, I Love Lucy, The Dick van Dyke Show, The Brady Bunch, Hazel and an occasional Happy Days episode, its concept of human habitats and behaviors is limited to those it sees in mid-20th century TV-land. It seeks to emulate the most senior, present member of the family unit, which more often than not is the maternal homemaker or housemaid figure of any of these ensemble casts.
“When in our dimension, the Tersus will reverse its pack-rat, slobbish ways in Kushner’s Cove and begin to emulate the Aunt Bea and Laura Petrie by cleaning and maintaining immaculate surroundings. Not a speck of dust or unswept floor will exist wherever a Tersus resides or hunts, which coincidentally gives it away to anyone with the right knowledge and perception. If your slovenly teenager’s room is suddenly sparkling, or your once-messy partner has recently begun obsessively vacuuming your home, you may have a Tersus on your hands.
“While the Tersus’ exact strategy concerning which types of human prey it prefers is still being researched, there are a few clear patterns already being discovered. A Tersus will not eat a magical human, as many could potentially have enough power to maintain control of their senses and actions after it has inhabited their body. It also tends to prefer devouring those with meat in their diets over those who are vegan, and appears to gravitate toward men with male-pattern baldness, Ed Hardy cologne, or anonymous social media accounts.”
About the author: John Fogg is a prominent documentarian of magical non-human creatures, specializing in carnivorous species that occupy the Dresden, Yoros, and Ishtarian dimensions. His encyclopedic studies are considered staples to magical beings, and he has has contributed to more than three hundred journals, compilations and anthologies. Fogg’s mysterious disappearance in 2013, has confounded and concerned his followers, but those closest to him hold out hope that one day he will return with knowledge of some new and exciting species.