Core

Aether is capable of interacting through what is known as a core. This Core, possessed by only some living things, processes the aether into usable efforts, known as Magic.
The Core absorbs aether into raw magic at a constant rate, and stores it. Once stored, this raw magic is released to the body as Ready Magic. As the body processes raw magic into ready magic, a toxin is formed. This toxin, while flushed from the body as soon as possible, can cause exhaustion in time.