Just finished 100% completing LoZ: TP HD on Herodorf mode! Unfortunately, the Cave of Shadows is ridiculously hard on Herodorf mode, and with some practice I could probably beat it (using the Wolf, Zelda, and Sheik amiibo), but ultimately I settled for just completing it on Hero mode. Tell you what though, the final battle is a breeze if you have max rupees, max wallet capacity, and magic armor!