Io is unfathomably large; it is said the largest dragon who ever lived is smaller than a single one of his scales, which are blue, gold, brass, or red, and edged with silver and dark purple. He can, and does, appear as any age or breed of dragon, however.
Io is paired with Chronepsis, who is seen as a re-enfolding that balances Io's extension of being into the worlds. As Io becomes all things, Chronepsis draws them back into himself. They are seen as brothers and represented in a complex symbol involving a nine-headed dragon swallowing its nine tails. Like Jazirian, Merrshaulk, and Shekinester, Io is an aspect of the World Serpent archetype.
Dragon gods, in general, have few temples. There are shrines in Io's honor, usually taking the form of open-air constructions surrounded by pillars and topped with domes. These shrines are placed in open terrain - the middle of a desert, for example, the center of a valley, atop the peak of a mountain, or on a vast, treeless plain. There is one construct known as the "Shrine of Io', it is a massive dragon skeleton, large enough for any dragon to walk into. Within the shrine lies the sacred hoard, a massive treasure accumulated over time by offerings made by countless dragons to Io.