Skjor

 is a member of The Companions and one of the leaders of The Circle. Before becoming a Companion, he was trained as a Blade and fought in the Great War against the Altmer before becoming critically injured in the fighting. Sometime before the events of Skyrim, Skjor and Kodlak Whitemane supposedly led a charge against an Aldmeri force of 40,000 men all on their own -though both played it off as a much smaller force. It is assumed that Skjor is one of the highest ranked members of The Circle, quite possibly next to Kodlak, as mentioned offhand by Aela and several other companions. In the quest The Silver Hand, you learn that he and the other members of the Circle are in fact Werewolves. He is one of the few Companions who assist you in becoming a Werewolf.

Quests

 * The Silver Hand

Bugs
A possible bug, Skjor returns to the Companions Hall sometime after the main quest line of the companions. Even if he does not return, the Companions do occasionally mention him as they would if he was still alive. Skjor has, for some people at least, returned to the Companions Hall and continues to offer quests.

In that case, if you are on PC, you can remove Skjor by opening the console, clicking him and enter "disable".

He has also been seen floating through objects, and even the ground around Skyrim. His body seems to be unable to move at all, with the exception of him blinking as normal. If he is attacked, he will only move around you and charge you, without actually attacking you, as he seems unable to. He can still shout combat lines, but the player is unable to interact with him. Exactly what the cause of this bug is, remains unknown. However, he will appear in Whiterun later, as it seems he is on his way there while he can be encountered in this state.

He also may sometimes return to his room in the Jorrvaskr Living Quarters, but he will be dead. Nobody seems to acknowledge the body.

He can also be found roving the countryside with Aela and the other companions battling Mammoths and the likes.

Trivia
Скьор