So, I love your headcanons. Something I'd like a headcanon for, and hear me out on this, is how the Guardians work. I'm really sorry if this is odd. I love your blog so much!
Odd? Oh dear anon, you underestimate me. You have no idea how much world building stuff is trapped inside of my head, just waiting to spill over and drown every unfortunate mortal that made the mistake of following me. Prepare yourself for
HOW SHEIKAH TECHNOLOGY WORKS (Headcanon....thing?)
Long post warning, also spoilers for the end of the DLC
You cannot create something from nothing, energy cannot be created or destroyed, that’s the law of the conservation of energy. [insert that quote from Full Metal Alchemist Brotherhood or something idk I’ve never watched it]
So how, you ask, are you able to do all that cool stuff in botw? From summoning bombs out of your pocket, to Guardians who somehow never need a power bank or charging station?
I shall tell you how, it's the Ancient Sheikah’s perfection of teleportation and the ability to convert energy
Observe, Exhibit A: Teleportation
Teleporting with Sheikah technology converts Link and his belongings into a pure, blue energy which disassembles and reassembles across Hyrule.
But the main thing to focus on here is the energy part of this.
[We know that it’s energy because it emits light, which you can’t do without some sort of energy, so it’s not just disassembling and reassembling atoms]
See, I’ve tested the timing on this and Link’s teleportation is instantaneous. Despite the loading screen, nearly no time passes whether he teleports from the Eldin mountains to the Gerudo Desert.
So, the Sheikah have the ability to convert things into energy and transport it instantaneously, no lag, no time wasted, you want it? You got it
I mean the pads literally say “calling” on them. So yeah, they can call upon this energy anywhere. Even note how when dealing with an actual Sheikah monk in the DLC, they don’t even need the Sheikah slate or pad things.
“Why does this matter?” you ask? Well, if the Sheikah are able to transfer and convert energy like this, who’s to say they couldn’t also apply this for offensive purposes?
Exhibit B: Bombs and Arrows
This same technology used to instantly transport and emit energy is used in the Sheikah’s offensive technology
The bombs and arrows have no battery, and no electricity, no way to store that kind of power used when actually fighting. How is this possible?
See that? The energy used to form the bombs is the same particles for when you teleport. The energy is coming from somewhere else, not from the Sheikah Slate itself
I mean when you even set off the bomb
You can even see the lines for a few frames of energy being summoned towards the bomb, and then expelled outwards in the blast.
Same story goes for the Ancient Arrow
So why do these Sheikah technologies not need an apparent “source of power?” Simply put, that energy is being stored somewhere else, and being transferred instantaneously to these devices.
Now, “where is this energy being stored?” So glad you asked, because insert segue into
Exhibit C: Blue Flames and other azure features
One might assume that the blue flame is what powers all this technology
See, I believe Sheikah technology is powered by some other kind of generator stored deep within the earth. We already see from the Divine Beasts that they can generate power from within the ground, so I’m thinking the actually source of all this blue energy is something deep in the heart of Hyrule
Ok ok, first as to why the blue flames don’t actually power everything
First off, the source of the blue flames? Babam, here they are rising out of the ground. You can even see how the pipes on them connect to the ground
The only pedestals that can house the blue flames are made with specific Sheikah technology. When you use a blue flame on wood or grass or anything, the flames don’t turn blue, they just become regular fire.
This suggests that the “blue flame” is just a way that energy could be transferred in a fire-like form, but isn’t actually fire itself
The furnaces Purah and Robbie use to power their Sheikah stones? That ain’t no coal furnace, no coal, turbines, steam, or wood to be found. Instead, it’s rigged directly to the ground, sooo again, the blue flame is just a means of transporting energy but isn’t a source in of itself.
Further supporting my belief that the actual source of energy comes somewhere deep below the earth are the towers
That blue rod that lights up when Link activates them? Safe to assume it’s the source of their power, OH and look it connects deep below the ground look at that
The Sheikah are so obsessed with underground stuff. Shrines and towers ruse out of the ground, you take those elevators deep underground, the DLC is deep underground, the Divine Beasts and guardians were underground, the blue flame’s source was from underground, the—
Therefore...the source of the energy, the energy that is being transported to all other Sheikah technology and powering stuff is from underground
And now, I actually address the original request of how Guardians work. Well class, if you have been paying attention and taking notes, this will all make sense
So, please observe Exhibit D: Guardians in the form of this gif
Now, if this laser worked like an actual energy beam and was being formed directly from some power source within this Guardian, would it really be stopped with one measly wooden arrow? The answer is no
See those blue rings forming around it just before it attempts to release a blast? That’s that Sheikah energy, the same stuff that teleports you, the bombs, and the energy on your bombs and ancient swords.
Why are guardians so light that a few swings with a sword can knock them over? Because they have no need for extra energy storage or large batteries, all the energy they need to function is just teleported at a constant rate
When opening them up, you can even see this energy moving through the air
And these things? These cores that are the source of their power?
The blue ring surrounding the larger one is similar to that of the blue rings on the teleportation pads. The smaller one has a small blue node which has the trademark Sheikah blue energy connection. These puppies are simply gateways for energy to be teleported within the guardians, and released to power them and their lasers.
TL;DR Guardians are powered from an external energy source probably stored deep below Hyrule, which is instantaneously teleported to their cores in which they can expel said energy without the need for charging or batteries.
Quick side note: Also all Guardians are connected through a central information system that is most likely based on the information gathered by the Sheikah Towers [as seen in the photo where guardian locations can be tracked when engaged with one] so the reason why they’re weak to electricity and can’t be submerged in water is probably because they still have individual computer like systems in order to analyze their surroundings and aim and such and is why they are able to sense Link’s presence even when shut off for several years.
And ALSO the guidance stones that drip the water-like substances is just another form in which the Sheikah’s blue energy is transferred and teleported as seen when Purah uses them, canonically moving it from Hyrule Castle to her lab in Hateno. So, location isn’t a problem when you can just teleport energy whenever you want and the only reason she needs the blue flame is because these guidance stones weren’t connected to the typical shrines or towers which as previously stated already have built in power systems underground