This is definitly not the hardest quest, but think about how hard waterfall quest would be without a guide..you would have to figure out where to put the rock, what runes to put on the pillar, to switch the ashes, to put the rope on the tree/rock, how many runes to put on each pillar, its a lot harder than you think. Another one is regicide..without a guide remember that machine thing? That would be insanly hard.