Regardless what other people say. This LoI quest shows that most people “skip” doing it which is mean it a failure as a developer if you planned this LoI thing to be a main quest.
And Slifer is right about the boss mechanic, if we dont change it now. Perhaps in the future we would have a boss with 1m HP meanwhile our jutsu hits like 200 damage. Furthermore since the boss can 1 shot you, so i guess the next boss will kill you twice