Istus is goddess of destiny, divination, Fate, future, honesty, and predestination on the world of Oerth. Her Realm in the Outlands is called the Web of Fate. There, she consorts with time+dimensionals from the Demiplane+of+Time.
Daoud was once her priest.
Sources: Complete Divine, Dragon magazine #69 - "The Deities & Demigods of the World of Greyhawk", Greyhawk Adventures, http://www.wizards.com/rpga/downloads/LG_Deities.zip,
Living Greyhawk Gazetteer, Living Greyhawk Journal no. 3 - "Gods of Oerth", On Hallowed Ground, Player's Guide to Greyhawk, The Temple of Elemental Evil, Warriors of Heaven
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