The ghast is a small, vicious creature that dwells in mountain caves. One is little more than a nuisance and will flee if threatened. A pack of five or more, however, is much bolder and can easily overwhelm a bear.
Although ghasts are cunning and able to cooperate for survival, they show no signs of true intelligence. They are unable to speak, communicating only through grunts and squeals.
Occasionally, a pack of ghasts will include the strange creature known as the velghastrial. Unlike the common ghast, the velghastrial can wield magic. Some assume that they first learned by lurking around and watching other mages. Others believe that ghasts, like animals, are sensitive to the unseen forces that shape our world and that the velghastrial is able to utilize magic purely through instinct. It is unknown if velghastrials risk possession when casting spells, as other humanoid mages do.