Returned to the game recently, noticed I still have some old quests on my list that I had thought that once upon a time I had completed. Apparently I have to re-do Ebon Tower, but the quest is stopped at approaching Ebon Tower with Killian's Gem. Where do I get that? I can't remember. I did go run Labyrinth of Terror thinking I had to go kill Killian for it, but it didn't drop off him so I am at a loss.