I don't think I've played and ogre up to 15 or if I did, I don't think I did the 15 quest.
But I do have a suggestion, don't be insulted if this is and alt and you already know this. A good thing to remember is try talking to the quest giver again. Sometimes you might have missed something important, or the quest giver might, just come out and say something extra, the ... can be found ...
Hope this helps someone, it has me in the past. GL