In respect to FFXIV Magic comes from an energy source known as Aether, which is produced by the planet itself. I may be mistaken, but there are several methods that casters use to channel Aether. For Conjurers they draw it from nature and the elements, acting sort of like Druids in the setting; while Thaumaturges draw their Aether from an internal reserve which makes it destructive and chaotic (which explains the fluctuating auras they have). One can only assume that the source of the Arcanists power is something similar to this, or perhaps a combination of both, or perhaps they draw power from symbols and words which explains the use of a book as their weapon.
If you're familiar with the lore for Final Fantasy VII, think of Aether in the same way as Mako. It's a form of energy that permeates from the planet, in large quantities it can be poisonous and even mutagenic, and under certain circumstances it can crystallize into Aetheryte.
If you're familiar with the lore for Final Fantasy VII, think of Aether in the same way as Mako. It's a form of energy that permeates from the planet, in large quantities it can be poisonous and even mutagenic, and under certain circumstances it can crystallize into Aetheryte.
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