Ever wonder exactly what an aetheryte is? I mean, you use them every day to get around.

Luckily we have some cool information from the lore team to share!
* Updated at 8:00 p.m. with the help of the Localization Team!

Quote Originally Posted by The Lore Team
What is an aetheryte?
Aetherytes are colossal structures comprised of crystallized aether. So that they may serve as waypoints for aetherial travel, these crystals have been amplified through the use of advanced Sharlayan technology.

Why doesn't everyone use aetherytes?
To traverse the Lifestream safely with Teleport and Return requires a great deal of spiritual energy, known as anima. While many individuals, such as adventurers, possess the fortitude to endure such travel, some individuals do not. What’s more, even if one has the ability to use aetherytes, the frequency with which one can do so varies. In essence, for some, the recast time for these spells can be far longer than for an adventurer.

As a result, only a fraction of the populace can utilize aetherial travel habitually, which is why chocobos, airships, and other forms of transportation still play a major role in Eorzea.

Why does it cost gil to use aetherytes?
Many aetheryte camps were destroyed during the Calamity, which necessitated their reconstruction. However, this came at great expense, and so teleportation fees must be collected to repay the as yet unpaid debt.

However, the gil doesn’t just magically disappear from your purse! Though it's not shown in the game, it's collected by the guards keeping watch of the aetherytes.

On a side note, guards posted by each city-state's aetheryte can tell you about aetherytes and teleportation magic. If you're interested, see what they have to say!