I believe there's some principles involving the Elemental Wheel and the cycle of Aether that can be found in the books and stuff at the Ossuary (Thaumaturge's Guild)? I'm not entirely sure if that fits what you're looking for, but it describes the elements that aether is used in, at least from a Thaumaturgic viewpoint.
And the whole Monk chakra thing I think is explained in those questlines. Basically you have parts of the body where you can channel your own aether through to bolster your physical abilities - increased stamina or power or what-have-you. And I think some have theorized (though it isn't outright stated) that channeling their aether into their legs is how Dragoons do their super jumpy thing.
I also think there's stuff somewhere regarding how Aether is basically the lifeblood of all living things and ties into a cycle with the Lifestream. And such energy that is lost suddenly and dramatically (such as the deaths caused by Bahamut) cause crystals to form.
... I'm sure Sounsyy will have more specific examples and quotes on the matter, though.
And the whole Monk chakra thing I think is explained in those questlines. Basically you have parts of the body where you can channel your own aether through to bolster your physical abilities - increased stamina or power or what-have-you. And I think some have theorized (though it isn't outright stated) that channeling their aether into their legs is how Dragoons do their super jumpy thing.
I also think there's stuff somewhere regarding how Aether is basically the lifeblood of all living things and ties into a cycle with the Lifestream. And such energy that is lost suddenly and dramatically (such as the deaths caused by Bahamut) cause crystals to form.
... I'm sure Sounsyy will have more specific examples and quotes on the matter, though.
~