Purity of Revenge

Purity of Revenge is a quest given to you by Vilkas when you enter Jorrvaskr after returning from the Blood's Honor quest.

Overview
Jorrvaskr was attacked by the Silver Hand and Kodlak was killed in the fighting. Vilkas wants you to travel with him to attack Silver Hand, retrieve the fragments of Wuuthrad, and avenge the death of Kodlak.
 * Travel with Vilkas to Driftshade Refuge, near Dawnstar
 * Kill all members of the Silver Hand (optional)
 * Retrieve all the shards of Wuuthrad
 * After that return to Jorrvaskr

Note: A bug exists in this quest that prevents it from being initiated. This can be remedied on PC, but console users will have to wait for updates. In order to Start the quest you need to find Vilkas, open the console and type "setstage c06 1" this will cause any follower to leave you and Vilkas to join you. The quest should then activate normally.

Note: (PC) A glitch also occurs where this quest cannot be started if the player has already cleared Driftshade Refuge. If you have already cleared it, then go back to the area and resurrect the three bandits from the last room of the fort (the room behind the barred door) by using the console commands before completing the previous quest. This will allow you to continue through the story correctly.

Note: (PS3) If driftshade refuge has been cleared completely (including the leader) before Blood's Honor was started, wait approximately 32 in game days (via wait) before collecting the witch heads. Then complete the quest as normal. This will reset the next dungeon and Purity of Revenge will trigger as normal.