After their parents are killed, twins Kael and Brenna Skyborn become Seraphim, aerial soldiers who use ice, fire, stone, and lightning as their weapons, as they prepare to fight in the brutal civil war occuring on the islands floating above the Endless Ocean.
- ISBN10 0316302686
- ISBN13 9780316302685
- Publish Date 17 November 2015
- Publish Status Active
- Publish Country US
- Imprint Orbit
- Format Paperback (US Trade)
- Pages 464
- Language English