You hve to go to bramble clan and click the blue arrow to the south and go to the left den and kill the guards and you press the stone and you get a vision you can press it too times and you will go to the nightmare like robynfur and you have to find the black figure that are at 1.leaders den (fire clan) 2.next to plumclaw and outside the leaders den to the right and thats how you get the achivement ''help robynfur with his headachs.