La quête est buguée, cherche pas, j'ai le même problème. Pas vraiment de solution.
Y a ça mais bon.
"Solution #1 - For adventurers who have not cleared Driftshade Refuge or completed the quest to find the Helm of Winterhold.
You may get the bug if you have the quest to retrieve the Helm of Winterhold for the Jarl of Winterhold, under misc quests, but have not completed the quest to retrieve the Helm. Load up on invisibility potions and sneak through the Refuge (killing no one), retrieve the Helm, and returne it to the Jarl. Then returne to Whiterun and Vilkas should give you the next quest, Purity of Revenge.
NOTE: You don't need to sneak or use invisibility potions in Driftshade Refuge. I ran through full speed ignoring everything until I got the helm and ran out. Turned the quest into the Jarl and THEN went to kill the witches. This wont work if you have already killed the witches and got the message to return to Kodlak. As long as you do NOT talk to Vilkas and finish Blood's Honor, you can repair the glitch in this fashion. -Correction- this CAN be done if the witches have been killed already and you HAVE NOT returned to Whiterun. Sneak through to retrieve the helm and return the Helm of Winterhold to the Jarl of Winterhold in order to complete the quest. After the quest is complete make your return to Jorrvaskr, and Vilkas should give you the next quest, Purity of Revenge. (XBOX). Confirmed x2 on Xbox 360. **** This also worked on PS3, I was detected twice inside Driftshade Refuge but I hid long enough for the enemies to go back to patrol mode.
Option for PC users who HAVE killed the witches and returned to Whiterun but HAVE NOT retrieved the Helm: Go to the Refuge and run through it without attacking (I left my follower in Whiterun to be safe). Enemies will engage, but with enough health, stamina, and armor you should be able to run through without dying. It may take a few tries to learn the layout well enough. Retrieve the Helm and run out, then travel to Winterhold and return the Helm. Travel to Whiterun, find Vilkas and initiate a conversation. Open the console (~) and type "setstage c05 1", press enter and close the console. Vilkas should join you and Purity of Revenge will automatically start. This method worked on PC version 1.3.10.
Solution #2 - For adventurers who have cleared Driftshade Refuge and completed the quest to find the Helm of Winterhold
Wait for 32 days before killing ANY witches for "Blood's Honor". Driftshade Refuge will still read as "cleared" on the map, but the enemies inside will have respawned at this point, allowing the quest "Purity of Revenge" to start as normal when you complete "Blood's Honor".
Soultion #3 (FOR PC ONLY) - For adventurers who have cleared Driftshade Refuge and completed the quest to find the Helm of Winterhold
Fast travel to Driftshade Refuge, enter the building and find the Silver Hand leader. He is the only enemy in full plate armor. Open the console, click the deceased enemy and type "resurrect". This will bring the enemy back to life. Do not attack him, instead leave the building.
Once outside, open the console and type 'player.setstage c05 0'
Note: Ref ID of Silver Hand Leader in my game was 0006a99c. You may be able to resurrect him without looking through the entire dungeon for his body. Try typing 'prid 0006a99c' followed by 'resurrect' in console, please confirm if this worked for you. -> Confirmed.
Solution 4 PS3 For those who have not received the helm of winter hold quest or cleared driftshade refuge. Complete the witch quest, but do not turn it in. Go to driftshade and get the helm without killing anything. Turn the helm into the jarl, then go turn in the witch quest, you will then be able to proceed. "
source : http://elderscrolls.wikia.com/wiki/Blood%27s_Honor
