Board Thread:Questions and Answers/@comment-32772019-20170809004522/@comment-78.194.252.210-20170809095451

when human use magical energy, they take mana from the air, mix it with od in their Magical Circuit, which allow them to produce prana, expulse in forme of magic spells.

Humans are od because it's natural in all life form, life energy, or Chi if you prefer? Magical Circuits are what allow them to mix it and produce prana to perform spells.