Bullhorn is Elwin's (Foxfire's physician) pet banshee. Elwin keeps him in the Healing Center at Foxfire. He is described as looking like a demented ferret with beady purple and grey eyes. A banshee can sense when someone's life is in danger and will scream when one is near death. It has been said that if a banshee lies next to someone, their condition is far more severe and the person may be even closer to dying. Bullhorn has laid near Sophie three times; when she was near death after having an allergic reaction to limbium, after almost fading away, and after Umber attacked her with shadowflux.
- Bullhorn is, presumably accidentally, called Bullseye on page 337 (hardcover) of Nightfall.