Quote Originally Posted by doomdoomdoom View Post
I think you mean the Obsidian award, it is for the very last mission against Hargkyth, not Kriegberg. To get it you have to complete the mission, not use any elixers, and not break any of the stones. I personally haven't gotten it yet. But I know several people that have. So far all of the ones I know that have this achievement did so in multiplayer (3 players all level 31).
You are correct i ment Obsidian Mastery....Sorry for the mis-information.