The Empyrean is a five-book series beginning with Fourth Wing (2023) and Iron Flame (2023). In the series, signets are magical abilities that dragon riders develop after bonding with a dragon. Each rider’s signet is unique and reflects both their dragon’s abilities and their own innate traits. However, signets do not manifest immediately. A rider must first survive Threshing, the brutal selection process where dragons choose their riders. Once bonded, a rider’s signet typically develops within weeks, though some take longer.

Signets vary in nature, ranging from elemental abilities like lightning wielding to mental powers such as mind-reading or dream-walking. Some abilities are highly effective in combat, such as shadow wielding, while others provide strategic advantages, like teleportation or memory reading. However, signets come with risks. Using one requires significant energy, and overuse can result in signet burnout, causing permanent physical damage or even death. Some signets, such as mind control, are outlawed due to their dangerous potential. Additionally, if a rider’s body is unable to withstand their developing signet, they may not survive its manifestation.

Throughout the series, signets play a crucial role in shaping battles and alliances.