Fell are migratory and prey on other intelligent species. They are one of the most, if not the most, feared predators in the known portions of the Three Worlds.
The Known Classes of Fell
Major kethel - The largest of the Fell, sometimes called harbingers, major kethel are often the first sign that a Fell flight is approaching. Their scales are black, like that of all the Fell, and they have an array of horns around their heads. They have a low level of intelligence and are believed to be always under the control of the rulers.
Minor dakti - The dakti are small, with armor plates on the back and shoulders, and webbed wings. They are somewhat cunning, but not much more intelligent than kethel, and fight in large swarms.
Rulers - Rulers are intelligent creatures that are believed to have some arcane powers of entrancement over other species. Rulers related by blood are also believed to share memories and experiences through some mental bond. They have complete control of the lesser Fell in their flights, and at times can speak through dakti and see through their eyes. (Addendum by scholar-preeminent Delin-Evran-lindel: Fell rulers in their winged form bear an unfortunate and superficial resemblance to Raksuran Consorts.)
There is believed to be a fourth class, or possibly a female variant of the Rulers, called the Progenitors.
Common lore holds that if a Fell ruler is killed, its head must be removed and stored in a cask of salt or yellow mud and buried on land in order to prevent drawing other Fell rulers to the site of its death. It is possible that only removing the head from the corpse may be enough to prevent this, but burying it is held to be the safest course.