The party, having successfully negotiated an alliance with the five metallic dragon races, returns to Waterdeep, once again riding on the backs of dragons. The ancient silver dragon, in her human form, attends the council (which has a new addition - Mr. Silvergleaming) with the party to inform them of the terms of the alliance. The council is overjoyed at the news... until they learn about the concessions the party made. 33% of the treasure, public apologies for ancient wrongs by the dwarves and the elves, turning over the dragon masks, and (worst of all) the party granted control of a key piece of land between Waterdeep and Baldur's Gate to the bronze dragons. Ultimately, the council knows the good outweighs the bad and accept the terms of the bargain.
The adventurers then relate the rest of their many adventures since their last meeting with the council (see everything from Rise of Tiamat Episode III until to now). The council is extremely impressed and grateful for all the party has done. It seems that the party has offered some hope of the factions putting aside their own interests and petty squabbling to unite against the cult. The council retires to deliberate. They will summon the party when they have reached a decision.
Roscoe, Oloril, and Mullyn are reunited with their new air genasi wives and establish households for them. Oloril's new house is next to Mullyn's, much to Mullyn's chagrin. Dain is reunited with his wife and infant son and spends a great deal of time with them.
Udofire, Oloril's father, stops by for a visit and offers to throw an extravagant wedding celebration for his son. This raises Oloril's suspicions because this is uncharacteristically fatherly. They haul Udofire before Lucien and Bardu, who divine that Udofire is, in fact, a doppelganger charge with extremely powerful magic. The real Udofire stands revealed as the Great Deceiver and Lucien's sight is returned upon the successful completion of his holy quest.
The characters are then summoned back to the council who has reached their decision. All factions vote in full confidence of the party and stand united, pledging the resources at their disposal to fight the cult!
The party is then informed of the chance to prevent the final battle before it begins - a rogue cultist has made contact with the council claiming to be in possession of the blue dragon mask. If the heroes can recover it, they could potentially thrwart the cult's plans entirely! The party teleports back to the hunting lodge near the destroyed town of Parnast and travels to the mysterious and magical Xonthal's Tower!