|“||Let me know if something frightens you princess,i'll go chase it away with my ax||”|
Thorn is a former crew member of the Wolfwind, Erak's ship. He was also, of course, a warrior, and was a good friend of Hal's father Mikkel before Mikkel later died on a raid gone wrong. Thorn lost his right hand to his skirl, surprisingly, in a storm in which Erak had to choose between cutting the hand or letting Thorn fall off the side of the ship. Later, he said to Erak that he wished he could have gone off the ship than losing his right hand. Before he lost his hand he was Maktig, the champion warrior of Skandia, three times in a row.
After that, he fell into a devastated depression, getting into the habit of "washing" his pain away temporarily at the local tavern. Finally, six years later, Karina, Hal's mother, manages to rouse him from this with the idea that he really is needed. Subsequently, he started working odd jobs around her eating house in exchange for housing, food, and pay. Most important, he becomes the mentor-fatherlike figure Hal needs, with the reasoning that "If he couldn't use the skills he had learned anymore, at least he could teach them to someone else."
Thorn also joins the Herons on the expedition to steal the Andomal back. During the expedition, he helped improve the Herons' weapons skills. After Hal tells the Herons about him being the Maktig three times in a row, they look up to him even more and follow him into battle.
He is a homeless vagabond, uncouth, dirty, and messy, especially in the first book. He has a bath once a month but says that he doesn't really need one. However, Hal makes a new "grabbing arm" that lets him row again, and a new war club to hit people with. He is built like a typical Skandian and is far more nimble than he seems.
Thorn has a great many skills, mainly in the areas of weaponry and fighting. He gives tips on fighting to Hal and Stig in the Outcasts and in the Invaders teaches the Herons to fight with greater skill which proves incredibly useful in the coming battles against the pirate Zavac and his crew.