
I'm late! Looks like your questions have been answered so I'm just gonna drop some lore on the subject of aether and those who use it.
So, as has already been said, aether is the life force of the planet and every living thing on it. It makes up all things and is the source of all magic. Eorzea has the greatest concentration of this aether because it is home to Lake Silvertear, the fount of all aether (and water) on the planet. There's a pretty real Garden of Eden comparison to be made to Eorzea. But really this is why Eorzea has developed many diverse schools and magical talents throughout history. Not to say magic is not possible outside of Eorzea, but it is certainly much less common.
On the subject of Magi and how they use their aether, I'll quote myself from this post:
Each person has their own varying but limited amount of personal aetherial stores inside their body, and per the 2.0 THM questline, seems to be a birth trait, not something one could improve upon during their lifetime. For Thaumaturges and Arcanists, who use their own aether to fuel their spells, this can be dangerous for them if they overexert themselves with more powerful or ambitious spells or attempt to cast magic for extended periods of time, such as in a battle setting.
Furthering on the subject of personal aether constraints, I saw teleporting got brought up, so I'll link a useful lore post on Teleport Lore. The gist is that anyone and everyone can learn to use an aetheryte (with practice) however, a majority of people do not have overwhelming aetherial stores or the fortitude to withstand multiple teleportations in short succession, so most people use them sparingly.
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On the subject of my own character - Sounsyy has very limited aether reserves. She has absolutely no magical talent and aetheryte travel makes her incredibly ill, so she avoids it at all costs. After barely surviving the Battle of Carteneau, Sounsyy suffered some severe aether sickness from being wounded in such close proximity to the Elder Primal and all the death He wrought. So that incapacitated her for a while and she's still in the long process of recovering. All that said, she doesn't really like aether being used on her for healing, though she tolerates it. She has an irrational fear that she's going to get sick again from it.
Hope this helped! ^^ Feel free to ask if you have more questions! I'm going to leave a couple related lore clippings in the Spoiler below to peruse at your leisure.
So, as has already been said, aether is the life force of the planet and every living thing on it. It makes up all things and is the source of all magic. Eorzea has the greatest concentration of this aether because it is home to Lake Silvertear, the fount of all aether (and water) on the planet. There's a pretty real Garden of Eden comparison to be made to Eorzea. But really this is why Eorzea has developed many diverse schools and magical talents throughout history. Not to say magic is not possible outside of Eorzea, but it is certainly much less common.
On the subject of Magi and how they use their aether, I'll quote myself from this post:
Each person has their own varying but limited amount of personal aetherial stores inside their body, and per the 2.0 THM questline, seems to be a birth trait, not something one could improve upon during their lifetime. For Thaumaturges and Arcanists, who use their own aether to fuel their spells, this can be dangerous for them if they overexert themselves with more powerful or ambitious spells or attempt to cast magic for extended periods of time, such as in a battle setting.
Furthering on the subject of personal aether constraints, I saw teleporting got brought up, so I'll link a useful lore post on Teleport Lore. The gist is that anyone and everyone can learn to use an aetheryte (with practice) however, a majority of people do not have overwhelming aetherial stores or the fortitude to withstand multiple teleportations in short succession, so most people use them sparingly.
--
On the subject of my own character - Sounsyy has very limited aether reserves. She has absolutely no magical talent and aetheryte travel makes her incredibly ill, so she avoids it at all costs. After barely surviving the Battle of Carteneau, Sounsyy suffered some severe aether sickness from being wounded in such close proximity to the Elder Primal and all the death He wrought. So that incapacitated her for a while and she's still in the long process of recovering. All that said, she doesn't really like aether being used on her for healing, though she tolerates it. She has an irrational fear that she's going to get sick again from it.
Hope this helped! ^^ Feel free to ask if you have more questions! I'm going to leave a couple related lore clippings in the Spoiler below to peruse at your leisure.