This is a constitution saving throw. If failed, within a few hours, the target bitten by a Flying Head Monster will first lose all their hair, their ears gradually transforming into leathery wings, tendrils extending from the chin and scalp, teeth lengthening into fangs until finally, the victim dies, the head separating from the body, becoming another Flying Head Monster.
Records at the Night Watch Headquarters have noted this type of creature. It is considered a relatively common kind of Evil Object, and those bitten by them get poisoned.
However, it's unusual to see so many Flying Head Monsters in the Real Plane. This swarm of grotesque heads, numbering in the dozens, typically suggests the presence of a more powerful Otherworldly Creature.
A swooshing sound ripples through the air.
