Geomancer: Maybe someday?

[JunseiKei]

~snip~

Yes and no. Aether is literally just life-force.

Carbuncles are literally stones given aetherial form and the books and ink for arcanists serve as a conductor for aether and spellcasting. Scholars use their soul stone to anchor the essence, or aether, of past mages given form to summon faeries. The egis are called from after a summoner's own aether has been stained/tainted by the primal's aether and may then call it forth. Astrologians project their aether toward the heavens to read and control fate/the heavens. Black mage's spells can mostly be done from a mage's own aether, but the more powerful spells do use the aether from nature. However, conjurer's quest line shows you that relying on just your own aether will actually kill you over time - this is a two-part reason why White Mages are limited to the Padjal lorewise. The other being white magic inherently drains aether from the surrounding land with all of their spells.

...It's kind of interesting how the lore book took the time to divulge the different impacts of aether use on the casting classes.

I don't know anything about Geomancer, but given the name, it sounds like it would do much like what a white mage does to cast spells. Didn't geomancer have something like attacks turn into certain types depending on the terrain they fought on? FFXIV doesn't actually use any type of elemental weakness system; makes me wonder what kind of changes would need to be done to the class to make it be its own thing for FFXIV.