The Empyrean Series 3 Books Collection Set By Rebecca Yarros (Fourth Wing, Iron Flame & Onyx Storm)
| Country | USA |
| Brand | Westminster John Knox Press |
| Manufacturer | Westminster John Knox Press |
| Binding | Hardcover |
| ReleaseDate | 2012-10-29 |
| UnitCount | 1 |
| EANs | 9780664221065 |