Tiamat has been trapped in the Nine Hells since the Time of Troubles in 1358 D.R. For the last 131 years, the Queen of Darkness has bided her time waiting for an opportunity to return to the Prime Material Plane. And now her plans are coming to fruition.
In the wake of the Sundering, the gods have stepped back and left their mortal worshipers to govern their own destinies. This has allowed Evil to creep back into the land and opened the door to Tiamat’s return. Brought together by the Cult of the Dragon, the evil dragons forge a powerful alliance. The leaders of the Cult view Tiamat as the unstoppable weapon they need to achieve total dragon supremacy and forge a powerful draconic empire, the likes of which hasn’t been seen in millennia.
Whatever happens, Faerûn will never be the same.