Beyond the Veil
It was at Ioun’s urging that Avandra took up the cause against the Abyssals, and she had a direct hand in bringing the Raven Queen and Vecna into the fold. In fact, she currently works closely with Vecna, her ancient enemy, to gather the most powerful knowledge in the world to find a way to stop Tharizdun’s return. Though she does not trust him whatsoever, she believes he holds essential information the alliance will need to stop the Abyssals.
The reliquary of the Saarun, an order dedicated almost entirely to Ioun, is one of her greatest shames, particularly now that it appears the Abyssals may use much of the knowledge gathered there in their mad quest for utter oblivion. Any heroic party successful in restoring the reliquary and sealing it away again would earn the blessing of Ioun in this fight, becoming her champions. She may even intervene directly, when the time comes. Choosing to instead destroy it, however, would surely draw her ire.
Ioun continues to attempt to draw more gods into the fight, and to watch Vecna closely for any secrets he may let slip. If any of the gods is able to determine Vecna’s ultimate goals in this fight, it is Ioun; she will remain one of the most important figures throughout the campaign.