Speculation on the nature of Null & the Triforce (EOW spoilers)

As we know from The Legend of Zelda: Skyward Sword and other canon, only a mortal can wield the Triforce (what EOW calls "the Prime Energy"). As the origin myth goes, in the form we have it now, the golden goddesses (aka the Creation Trio, the story universe's omnipotent power), made the Triforce for mortals and made the lesser goddess Hylia to protect the Triforce and the non-demon mortals. That's why Hylia becomes the first Zelda, after nearly losing to Demise: to be able to wield the Triforce in defense of mortals instead of only to guard it for them. And depending how we interpret Demise, it's potentially also why Demise became Ganon and Ganondorf, but that's fully optional; Demise is a demon first, whether or not he's a deity also, and demons are mortal. So, clear: The blood of the goddess, the spirit of the hero, the hatred of the demon king -- all endlessly mortal, because only mortals can wield the Triforce.

(TLOZ was originally Tolkein-inspired, but vacuums up literature and mythologies and folktales like a katamari.)

( Spoilers for EOW (which has been out since September and is a <30-hour game, so if you're not already spoiled, kudos on your internet stealth skills!) )