[LUCKY FOR INABA...Faize likes giving explanations. Symbology, in particular, is one of his favorite topics.]
I suppose you could say it uses mental energy, in a sense. As I said, mental focus is a necessity. As a result, using it can be rather draining, especially when using it in battle as it is often necessary to cast multiple symbols, very quickly, for a prolonged period. [Lucky for Faize, he uses a sword too so he's not a pure magic user. Or is that unlucky since it means he's exhausting himself both mentally AND physically...] Of course, reaching a point of exhaustion depends on the skill and fortitude of the symbologist.
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I suppose you could say it uses mental energy, in a sense. As I said, mental focus is a necessity. As a result, using it can be rather draining, especially when using it in battle as it is often necessary to cast multiple symbols, very quickly, for a prolonged period. [Lucky for Faize, he uses a sword too so he's not a pure magic user. Or is that unlucky since it means he's exhausting himself both mentally AND physically...] Of course, reaching a point of exhaustion depends on the skill and fortitude of the symbologist.