Furcas
Teaches philosophy, astrology, rhetoric, logic, palm reading, and divination by fire.
A lesson in the Art of Psychic Science: The darker the berry, the sweeter the juice. Psychic attacks fall victim to dark energies. Psychic attacks never feel nice or sweet. That's why they fall victim to the dark berry.
A demon said to appear in the form of a cruel man with grizzled hair and a long beard. He rides a pale horse and carries a sharp spear. Furcas is named in both Wierus's Pseudomonarchia Daemonum and Scot's Discoverie of Witchcraft. He also appears as the fiftieth demon in the Goetia. He is credited with the rank of knight and is said to command twenty legions. Despite his intimidating appearance, Furcas is primarily a teaching demon. He is said to instruct rhetoric, astronomy, and logic. He also teaches the occult arts of chiromancy (palm reading) and puromancy (divination by fire). Furcas is the only one of the seventy-two Goetic demons credited with the rank of knight. David Rankine and Stephen Skinner, the editors of the Goetia of Dr. Rudd, suggest that this is a result of misinterpretation of a Latin word in the Pseudomonarchia Daemonum's description of the demon. They feel that the term miles, which means "soldier," was intended to be rank. They attribute a rank of duke to Furcas instead. According to the Goetia of Dr. Rudd, he can be constrained in the name of the angel Daniel. See also GOETIA, RUDD, SCOT, WIERUS.
THE DICTIONARY OF DEMONS, REVISED AND EXPANDED, M. BELANGER (2021)