i done it at about 35 i think, very easy quest actually, it was my second attempt though i went down there when i was about lvl 10 and got hammered cause i hit the tree without looking around first for the place to stand and then spent the rest of the time looking for it and getting hammered by spirit, didnt last too long at all. So when you go to tree have a look about first so you know where to go when youve hit the tree. Personally though i wouldnt bother, i dont it so i could get cosmics and i have never been back there for some reason, i would just leave it untill you can wield d long no point otherwise,