Lun was born some time after Thaegan's return to Deltora. Its father, if there was one, is unknown. It and its twelve siblings roamed Deltora's northeast, terrorising the countryside.
The Deltora Book of Monsters
Lun and its siblings captured a group of travellers on the road and ate all but one before falling asleep. The man was able to escape, though he had no memory of anything before the incident. Josef met this man, who gave him the details on Thaegan's children for his book.
Lun, Lod, and their nine surviving siblings —Hot, Tot, Fie, Fly, Zan, Zod, Pik, Snik, and Ichabod — all join forces to seek vengeance on Lief, Barda, and Jasmine, for the deaths of their mother and siblings. They pursue the companions, disguised as wolves, and force them into a net trap. However, the siblings begin fighting over how the food should be divided. Through Lief's encouragement the fighting became lethal, and Lun and all its siblings died, except for Ichabod.