Expanding Tyranny of Dragons. The loss of Skyreach Castle in Hoard of the Dragon Queen was a major setback to the Cult of the Dragon, but still only a setback. The cult is determined to retake the castle and claim Tiamat's lost treasure buried in its frozen walls and cloudstuff vaults, but they aren't the only ones. Giants and creatures of the frozen wastes wish to claim that wealth themselves!

This 5th Edition Dungeons & Dragons adventure is designed for 10th- and 11th-level characters, and is set in the Forgotten Realms.