After the funeral of Kodlak Whitemane at the Skyforge above Jorrvaskr, the blacksmith, Eorlund Gray-Mane, will ask you for the Fragments of Wuuthrad that you retrieved from the Silver Hand hideout during the previous quest. He will also ask a small favor; to fetch him a secret piece from the late Kodlak’s chambers. The Fragment is located in the end table in his bedroom, so take it and return it to Eorlund. When he accepts it, he informs you that the other Companions have gone to the Underforge for a gathering and says that you should join them.
You will find the three members of the Companion’s inner circle (the werewolves), Farkas, Vilkas and Aela, gathered around the blood fountain engaged in conversation. Each and every one of them admits that Kodlak’s death was avenged but that his soul now belongs to Hircine, and is destined to hunt in his Realm forever, instead of his desired afterlife in Sovngarde.
While they regret his fate, they can see no solution, until Eorlund Gray-Mane enters the cave carrying the repaired Wuuthrad on his back. He announces that there is a way to grant Kodlak his final wish, and after explaining what must be done, gives the thousand-year old Wuuthrad to you. The three Companions will then depart for the legendary Ysgramor’s Tomb. As soon as you’re ready, go after them.
As soon as you enter the tomb and meet the other three, Vilkas will warn you about the dangers ahead. He also says that he will take no part in this task, as he has too much grief in his heart. Activate the Ysgramor statue, which will place Wuuthrad on the statue and lower the wall to the north. If you want to wield Wuuthrad in the coming battles, you can reclaim it.
Proceed forward through the spider webs with Aela the Huntress and Farkas at your back. Before long, you will encounter several Companion Ghosts, who will test your courage by trial of combat. Defeat them and make your way to the large room with a pond in the middle, where Farkas will announce that he can continue no further, for the reason that ever since the events back in Dustman’s Cairn he’s developed a phobia of spiders. He leaves to make his way back to Vilkas.
With Aela the Huntress as your only follower, hack your way through the spider web and face a huge nest of frostbite spiders, both small and big. Be prepared to cure yourself from poisoning if necessary. The second room is sealed off, so pull the chain and go down the stairs for even more battles against Companion Ghosts. In the third chamber, use the handle on the pedestal to gain access to the northern room, where four more ghosts await. Defeat them and read the Two-Handed skill book The Legendary Sancre Tor before entering the burial chamber.
You will find the ghost of Kodlak Whitemane standing beside the Flame of the Harbinger. After explaining that the room you are standing in is, in fact, swarming with the ghosts of his predecessors, whom you are unable to see, he will ask you if you still have the severed heads of the Glenmoril Witches (you will as you cannot remove quest items from your inventory except by completion of a quest). He will then ask you to throw one of them into the Flame of the Harbinger, in an attempt to cure him of his lycanthropy curse.
Toss one of the heads into the fire and watch Kodlak start to twist and turn as his werewolf spirit emerges from his mortal form and immediately attacks you. After the battle, Kodlak will thank you wholeheartedly and suggest you as the new leader for the Companions. He will then travel to Sovngarde and finally find his peace.
Additionally, if you’ve become a werewolf during your time with the Companions, and you now wish to cure yourself of the condition, you have the option to throw another witch’s head onto the fire (if you had more than one) and kill your own Wolf Spirit. Be advised however that once done, this is irreversible, so think carefully.
Aela will accept your new status as leader, but will want to stay in the Tomb for a while longer, for further studies. She is, however, available as your follower should you ask her to accompany you.
On the northeastern ledge there is some valuable loot and a chest containing the Shield of Ysgramor. If you left Wuuthrad at Ysgramor’s statue, you can take that as well before you leave. When you’re done, exit through the nearby door, or, alternatively, exiting the tomb through the western passageway will lead you to a set of stairs and a wall with a Dragon Shout engraved upon it.
So ends this quest and the main story-line of the Companions, although all of the Companions’ radiant quests will now be available to you, along with three new ones.