From the publisher:
The Stormbringer family of storm giants has long extorted gold from coastal towns as a "good weather tax." Fed up by rising taxes, the towns recently sent a band of stalwart adventurers to finish off Stozari Stormbringer for good (as witnessed in DCC #21: Assault on Stormbringer Castle). But when the adventurers struck down Stozari, they only made her more powerful. Through eldritch rituals, her life force has been transferred by her daughter into the Stormbringer juggernaut, a massive 800-foot-long giant-scaled assault ship bristling with weapons of war. Capable of laying siege to a large city or defeating an entire navy of human ships, the juggernaut is a potent weapon to bring larger cities under the control of the Stormbringers. Now this living juggernaut has set sail for the coast, and only the heroes can stop it!