Aether
Aether is the stuff of raw magic, surging through leylines that invisibly crisscross the globe. Aether can be detected with supernatural senses and mages tap into it to shape their spells. Places where leylines converge are places of power, where magic is easier to cast and supernaturals thrive.
Aetherite
While Aether is unknown to humanity as a power source, aetherite has become a subject of intense study in the human world. When leylines are concentrated enough, aether begins to leave a crystalline residue that, over time, collects into harvestable formations. The purer the aetherite, the more raw power contained.
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Aetherite is Callisto's main export as the confluence of leylines beneath the ocean's surface and the nature of the seabed floor produce exceptionally pure and plentiful aetherite for harvesting by those willing to free dive into the deep waters.