Glass Dragons

Glass Dragons is a 2004 novel, second in the series The Moonworlds Saga by Sean McMullen.

Plot summary

The use of the weapon in the first book has led to storms that sweep the planet and make travel by sea nearly impossible. A group of magicians thinks it has the way to stop the storms: Dragonwall, a device that will drain the storms' energy. But when Dragonwall's true purpose is discovered, it's up to the priestess to destroy it by any means necessary. Meanwhile, the world has a new vampire, looked after by the old one and an unlikely genius who travels with a fallen courtier. All of them, plus a motley crew of soldiers and a sorceress (who wants nothing more than good food and pleasant company) must help the priestess destroy Dragonwall before it's too late.