Publication History
Io was first detailed in the book Monster Mythology (1992), including details about his priesthood. Io was detailed for the Forgotten Realms campaign setting in Cult of the Dragon (1998).
Io appears in 3rd edition in Defenders of the Faith (2000). His priesthood and his role as a draconic deity are further detailed for this edition in Draconomicon: The Book of Dragons (2003), Complete Divine (2004), and Races of the Dragon (2006).
Read more about this topic: Io (Dungeons & Dragons)
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