Good that I made a safe copy before, though I doubt I can handle the final boss on normal plus cursed ring. ;p
I assume there are LPs of Forbidden City to see that ending? Also, the hint was a bit troublesome as "or a normal lad" would hint at "only hero mode" and I wasn't sure if the Whisp Ring might be the Skull Ring (he I assumed that might influence the Whisps he shoots).
You could also just make a sloppy ending for easy/very easy "why were we so afraid, even a little kid could beat him" and give the normal ending there as reward.
Hope that doesn't sound like I expect it to be changed, the quest is obviously already great the way it is, just kinda the way I talk ;p
Could you give me a hint where to find the remaining 4 rings? I also aren't sure, what the Bomber Ring does, didn't seem to me like doing more damage.
Could be helpful to have a hint ingame, what's needed for completion. Or to give a book on the right side in the ring shop to show after beating the game where the rings are positioned (just "in an overworld cave" or so, nothing too handholding. Also in a different order, alphabetical.)
My favorite dungeon is level 5 btw, and I think the before final boss in level 6.
My least favorite areas are Kasuto (too high damage) and the Goron Mine (navigating through pits/damage combos while confronted with flame trails, vanishing grounds, shooters and whisp bats, yuck!).
Some more to come, have to look at my notes for that first and not in the mood for it