As we've seen so far (as of 12/8/16), there seem to be no "key" items in Breath of the Wild (i.e. Hookshot, Megaton Hammer, Gust Jar, etc.). In almost every past Zelda games (with the first two being exceptions) these Key items have corresponded to a dungeon / temple and are the "key" way to defeating the boss. With weapons seemingly limited to melee weapons (with some being rods that shoot energy) an several types or bows and arrows, that leaves us with the tomes. However, tomes are found seemingly randomly across the landscape, and some don't seem to be oriented for combat at all. For this reason, I ask you Reddit! How do you think Bosses will work, if they even exist at all?