Farran the Poisoner was a male fox murderer who specialized in killing his victims with deadly substances. He followed Ferahgo the Assassin's horde, occasionally working as a mercenary. His fur was completely black and his eyes pale amber; it was said that he could kill with a long stare. Farran never spoke, only gesturing in response, and often walked on all fours. His clothing consisted of an adder-skin belt with pouches made from the skin of bats. He also carried a dagger made from greenhart wood that had a poisoned tip.
Ferahgo employed Farran to enter Salamandastron and poison the food and water supplies. He assassinated Windpaw in the process, but otherwise the mission proved to be successful. However, he had not planned on the poison working so speedily; when Shorebuck was killed prematurely at the breakfast table, he was discovered and forced to run for his life. Farran the Poisoner was corralled into a lower chamber of the mountain by the hares of Salamandastron's Long Patrol, and was killed there by Urthstripe the Strong soon afterwards with his own poison.
Later, Klitch drank the poisoned water, by which he met his untimely demise while the Guosssom and the Long Patrol hares were celebrating their victory over the Corpsemakers.