A seemingly supernatural being which is recorded as having descended upon the French principality of Averoigne, particularly Vyones and Ximes, from an ominous red comet which appeared in the sky in 1369. It has no true body of its own, but needs to take possession of the body of another to feed, transfiguring and horribly reshaping the host's body. Resulting form is that of a pitch-black semi-humanoid figure, surrounded by a hellish nimbus of changing, fiery light, dimly revealing its shape. The limbs sway and writhe like boneless serpents, and grow sharp, hard claws. The neck similarly extends to a serpentine length and flexibility, whereas the head turns flat and reptilian, earless and noseless.