Ioun is the goddess of magic and knowledge. While the other gods spent the early years of the world exploring the physical planes, she explored the Astral Sea and eventually discovered The Source. When Vecna began his campaign to seize control of it, she dedicated her endless life to defending it from him.

Due to her detachment from the world, Ioun has very few worshippers, but there are a number of scholars who worship her, such as Moda.

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