Castle of the Storm Gods: A 16th Level Adventure for 5th Edition

When the giants were birthed unto the world, they immediately came into conflict with the smaller races of men. For a decade, a great war was fought until eventually the majority of the giants were forced across the Cressian Strait to the Isle of Frostmarch. A peace was established, and for centuries, conflicts between the giants and the races of men were few and far between. But that peace would not last.

Zokaros the Mad, a giant mage of incredible intellect and cunning, devised a plan to retake the mainland for his people. He built in secret a massive floating castle, powered by rare crystals mined by his brethren in the Unterrealm. Once complete, he and his followers boarded the flying fortress and began their descent towards the mainland. As the castle flew, it turned the very weather against those below it, bringing about massive lightning strikes that laid waste to everything that passed beneath the castle.

Now, the castle is crossing the Cressian Strait and heading straight for the human city of Dureya. The city has mustered all its defenses, but fears they will not be enough to stand against the giant's new weapon. In desperation, the Ivory Council, the ruling body in Dureya, put out a call for adventurers to come to the city's aid. They have offered 25,000 gp in exchange for the destruction of the flying castle. Should no one intervene on Dureya's behalf, the city will surely fall to the giants.