Not very far into Echoes of Wisdom yet, but I defeated Possessed Link by distracting him with a moblin and then sneaking up behind him and making snakes bite him in the butt repeatedly. So henceforth I will be spreading headcanon propaganda of this Link developing a paralyzing fear of snakes coming for his ass.
In Echoes of Wisdom, we encounter the Triforce for the first time in a long time (in its usual state, anyway). But something that stood out to me (and a lot of people, I'm sure) was the title it went by: The Prime Energy. It's not something we've heard before, so we have to wonder: why? I obviously can't give a "canon" answer, but I do have some ideas.
Energy in Echoes of Wisdom
Throughout EoW, we collect little blue crystalline shapes called "energy." This replenishes the gauge that allows Zelda to use her swordfighter form. These crystals are found throughout the Still World and appear tied to Might Crystals, which also appear from the rifts (but only when they close). We use them to upgrade the sword and bow themselves.
There are two safe assumptions we can make about Energy:
Might Crystals are the "purified" form of energy or something close to it (its resemblance to bismuth "crystals" seems to hammer in this implication).
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"Energy" is the essence we see Null consume in Din's tale. It appears on its own even before land and sky are built around it. Because of this and the association to might and vitality, this essence must be that of life itself. (Perhaps Zelda's role as a Priestess is what allows her to use this energy in its raw form and gain that supernatural state, unlike Link?)
How may the Triforce relate to this idea of energy?
We know that Din, Nayru, and Farore go on to create the land of Hyrule (or what would become MANY Hyrules over time) to seal Null and prevent its destruction of all life. In A Link to the Past, Ocarina of Time, and Skyward Sword, we are told the Triforce is left behind in the wake of this world's creation (creation over the void, in the context of EoW).
The Triforce has the ability to judge those who use it (even going as far as to prevent deities from using it) and its essence speaks to Link in ALttP. Although it may not be "alive" in the same way most mortal characters are in the series, it has a will. This will knows not of good and evil, only of the traits each piece is meant to embody.
We also know that the Triforce has dominion over said world and beyond, being able to shape realms by its wish-granting and power-giving abilities. Hence, the idea of "prime." And, in Lorule of A Link Between Worlds, we can see just how much the rest of the world depends on the Triforce's existence for its energy to be sustained.
EDIT: Don't forget the Force Gems in FSA! They further emphasize the ideas above in the same way!
It's also worth noting that the Tris are tied to the idea of threes, and they are the idea of "existence" to Null's "nothingness." They reinforce the idea of the Triforce's embodiment of "being."
The "Prime Energy" is the Triforce's true name and original state - its intended title. "Then," You may ask, "Why have we called it the Triforce up until this point?"
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Why the Triforce?
It is after the three leave that Hylia is brought into existence with the sole purpose of protecting the Prime Energy. But there's an important detail many overlook:
Hylia doesn't know the purpose of the Triforce.
Not fully, anyway.
Yes, Hylia knows how it works - her whole plan to defeat Demise revolves around it - but she still has questions. Even with all of her memories restored, the first Zelda states that she doesn't know why the Triforce was left behind. She guesses that it was to give the people of the world Hope (perhaps even against world-destroying entities like Null, should he break free...). Even then, it's only a guess.
Doesn't it stand to reason, then, that she wasn't even given its name? After all, she was only created to understand and protect the golden power; perhaps even as an "extension" of its being, given her often implied powers over light and time magic (but that's just a personal headcanon). Perhaps "Triforce" is simply what she took to calling it, as she still could recognize that it was something beyond the nature of the mortal world. (Also, I see it reasonable that she could see Tris - she probably saw them patching rifts and drew a connection between them, which influenced the name).
And, in the thousands of years to follow, wars become waged over the Prime Energy as it is understood only as a relic: a relic meant to give ultimate power to the one who touches it.
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Conclusion
The Prime Energy is the true name of the Triforce, and it is the core to the many realms of Hyrule. Its nature has been misunderstood by many throughout its existence, but none of these ideas are truly false; it holds dominion over time and space while simultaneously keeping it together. It is an essence of the very concept of "life," and as such holds a sort of "will" of its own. It is the ultimate state of the Energy we see everywhere else in Echoes of Wisdom, and Hylia may not be far off - despite being a neutral force that begins and ends wars, it may just be personification of the idea that life will prevail. Although the worlds in this franchise may be scorched and healed, they are never meant to fade into nothingness like Lorule once verged. They are simply meant to be.
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to those who may have scrolled to the bottom because this is unnecessarily long, it's basically just what its name was supposed to be when the three created it but then they just sort of forgot to tell hylia that or anything else lol. also it may just be a personification of existence like the fittingly-named tris.
I love love love solving little Zelda lore puzzles, I may do this again. :) I just HAD to lore dump when a friend asked me about it
NEW TRAILER!!! A lot of Link's traits seem to reflect in Echoes of Wisdom Zelda! Especially all that sleeping during battle... All the possibly angsty headcanons/predictions aside (like Zelda definitely being traumatized with losing both Link and her father to the rifts and then possibly seeing them petrified/possessed, etc), I imagine her and Link both share a love for animals! I really hope she can pet the kitties. Maybe she's even more of an animal whisperer than he is? I can see it now... tossing a cat army at a moblin...
New Echoes of Wisdom Trailer!! I already have a headcanon that the main horse Zelda rides in the trailer/render is a bit young. Perhaps not a foal, but just out of that stage. Otherwise, it might be a bit too big...