So i have submitted comments to this error on Blizzards forums, and i seemed to receive a lot of hate for complaining about the fact that they have not fixed this issue. I got 10 dislikes (down votes). But not one single reply to tell me that i was wrong or making a hasty judgement.
As others have experienced, there sometimes is a bug when trying to complete the destruction warlock artifact quest chain Ritual Ruination. If you go through the process and get to the point where you select the scepter of sargeras, but then experience not being able to complete the last section (ruin the ritual) by clicking the alter, the quest will not finish. It's hung logic. The way it is written you won't be able to finish it because it is saying you have the scepter already and left the area. QA from Blizzard has to go in and do one of three things - 1. wipe the quest completely, causing you to start over from the beginning. 2. hard delete the scepter from your warlock's inventory cache on their backup of your account so that the quest will recognize you did not pick it up yet, therefore allowing you to pick it up again, thereby triggering the rest of the event as intended. 3. hard complete that section of the quest for you on their server and porting you directly to the class order hall in order to complete the end of the artifact chain.
A few other key notes. Users have tried everything within their reach to fix this - i.e. waiting for the NPC to respawn and kill him again, dying to see if that resets it, closing the game and coming back on, closing the game and deleting the WTF, CACHE, and INTERFACE files from the WoW folder to reset these from the main server, trying to abandon the quest - which will not work based on the fact that you have the scepter in hand. So it is clear that Blizzard's QA must get involved in order to fix this one issue. I am sure they are trying to fix many other issues out there, but for those of us that wish to play as destruction, you are out of luck. If you didn't pick another artifact, choosing to start with destruction, you can't get into the class order hall, you can't open your artifact to display the talent tree, you can't pick a starting zone, and you can't begin your warlock specific quest chains.
I'd say this is a pretty significant problem that is not being addressed.