Quote Originally Posted by MistakeNot View Post
For the rest of the DoW/DoM classes/jobs it is never explicitly explained just how they use aether - we only assume they do since some of their abilities would otherwise be physically impossible.
The DoW classes almost certainly use their own aether. The DoM classes probably do so as well.
To add my knowledge/theories on how other classes are using their aether:

Maschinst:
"Next, let's talk about that contraption at yer waist. Now, I don't rightly understand it, but the boss tells me it draws on the aether in yer body an' turns it into the spark what'll feed some new devices 'e's workin' on."
Apparently they're using their own aether and then have their devices use it.

Paladin
:
Seeing how they were able to use crossclass-skills from conjurer, my guess would be that they're able to utilise aether in the same way conjurers do. All their skills seem to be very "white mage"-based aswell.

Bard:
Since they dont make much use of an form of spell casting, I'd expect them to use their own aether for that one magic ability they have - the wind-magic-dot. The poison-dot is more likely real poison? And all other abilities arent magic based, seeing how they literally sing their songs to buff their friends and weaken their foes.

Scholar, Summoner, Arcanist:
I can only make very vage assumptions based on their skills: They seem to be able to draw aether from their enemies with "Energy Drain", but since thats a specific skill, I'd guess they're mainly using their own aether (they certainly do to call their pets) and pressing that into skills via mathematical-patterns. I wouldnt be terribly surprised if thats even the most effiencient way to use your own aether: By careful calculations.

Darkknight:
Seeing how the whole quest talks about "channeling the darkness inside yourself", I'd expect them to use internal aether and not draw from the outside - I'm not 100% certain that that "darkness" is also a metaphor for aether, but to me it seems like the dark knight is more self-centered in most aspects, so I dont expect them to let the land bleed dry.

Ninja:

"We draw power from the world around us─the heaven, the earth, and the hearts of man─and channel this power into physical form. I am told that this is similar to your concept of...ay-ther, was it? I must confess that Eorzean words and ways remain unfamiliar to me.
How does one channel this power, you ask? Through the use of mudra, hand gestures that call forth each of the three forms of energy of which I spoke. The first mudra I will teach you will call power from the heavens. In Doma, we call this Ten."

Sounds more like mainly external aether - even though "hearts of man" could refer to internal aether.

Dragoon:
In terms of the jobs we can pick in the game, one would need to be more specific and call this the Azure Dragoon - the Dragoon choose by the eye of Nidhogg, which is basically pure aether, and draws their power from it.
"The Eye is no ordinary relic. It harbors the power of the dragon, which it bestows upon a single chosen soul─the strongest and wisest dragoon."
Seeing hoe dragoons arent heavy-spellcasters, my guess would be that they're mostly using their own aether for all of their more magic-like things, which the azure dragoon being able to draw aether from the Eye (as long as it exists, at least).

Monk:
The whole chakra-mechanic seems to rely on internal-aether - they say that much.
But in order to open your chakras and make use of that power, you need external aether: "We stand on an ancient battleground. A great war was waged here. The spirit of the fight lingers. The aether reaches for the chakra. It aids in their opening. That is why we monks seek such lands."

Warrior:
Only guessing again, but that guess would be that their "rage"-like state is based on internal aether, rather than external, seeing how they loose their mind over it etc.

...I dont have any real argument on samurai, but seeing how that class is more actually build around swords-techniques than magic... internal?

Drawing aether from the land seems to be both dangerous for the user and damaging for the land, and seeing how most jobs dont use extremly powerful spells - exceot BLM and WHM - I'd expect them to not take the risk and just use their own body-aether for the simple, little magic "tricks" they're performing.