first you have to do all the mossback quests in order, first cave of solitude, then kishibe village, then shirataki temple. after shirataki temple you get the purifier badge. then visit mossback in ancient burial grounds then visit wavebringer in the village of sorrow. you fight oakheart in the village of sorrow. then visit oakheart (purified version) in the tree of life and he gives you a quest to fight spiders and plant fertile soil. then visit him in the garden dojo. mossback, wavebringer and oakheart are all in there and they give you 2850 xp, a ring, and a robe.
