Svern

Svern is a male polar bear who is Svenna's mate and father of cubs, Stellan and Jytte. He met Svenna through their interests in the ancient stories and they met at the Den of Forever Frost to recite them to each other. Svern was named after the star with the same name, that represented the hind knee of the Great Bear constellation. Jytte was very interested in learning about Svern, which was unnatural for polar bear cubs as the males left their mates after the cubs were born. Svern had joined other males to participate in hunting seasons known as "roarings". In the Great Bear constellation "heel follows knee", but Svenna explained that she did not follow Svern, saying that it was tradition.

Description
Svern was described by Stellan in The Den of Forever Frost as, “..a grotesque, staggering wreckage of a bear — earless, with old blood and dirt stuck to his fur, and missing three claws on one paw.” and later described with the top of his head being mutilated, “Black skin bubbled up where ears had been.” and thin.

The Quest of the Cubs
Svern is not mentioned in this book, but there are many references to him, as Jytte wishes to meet their Da, and they (Stellan, Jytte, and Third) has a quest to find him to destroy the clock.

The Den of Forever Frost
In here, the cubs (Stellan, Jytte, Third, and Froya) finds Svern in a bad condition, and Svern was not very welcoming, but soon, he accepted that the cubs were his duty and taught them different weapons and lessons to prepare going into the Den of Forever Frost. Sadly, he didn't go in with them for he encountered Dark Fang. He made a false trail away from his den, so that Dark Fang would follow him and hoped that the cubs would leave without him.

The Keepers of the Keys
The cubs travel with Svern to the great Ga'hoole tree to the owls, and then go to the Beyond to recruit an army of wolves and owls alike.