Fourth Wing » Sloane Mairi

Sloane Mairi

Sloane Mairi is a rider in the Riders Quadrant and the younger sister of Liam Mairi. She bonds with the red daggertail Thoirt and wields the rare Siphon signet, which allows her to draw power from others.

Sloane
Name Sloane Mairi
Age 20 (Iron Flame), 20–21 (Onyx Storm)
Species Human
Status Alive
Quadrant Riders Quadrant, Basgiath War College
Rank/Title Cadet
Signet Siphon
Eye Color Sky-blue
Hair Color Blonde
Dragon Bond Thoirt (Red Daggertail dragon)
Family Isaac Mairi † (father), Colonel Mairi † (mother), Liam Mairi † (older brother)
Love Interests Dain Aetos (alluded)
Appears in Iron Flame (2023), Onyx Storm (2025)

Biography

Sloane Mairi, daughter of Isaac and Colonel Mairi, lost both parents to execution after the Tyrrish Rebellion and was separated from her brother, Liam. At Basgiath, she bonded with the red daggertail Thoirt and manifested the rare Siphon signet, capable of drawing power from others.

Initially, Sloane loathed Violet Sorrengail, blaming her family for Liam’s death, and openly sought revenge. Over time, however, she overcame her hatred, gradually learning to trust Violet and even fight alongside her. In Iron Flame, she played a key role in raising the wards at Aretia, and in Onyx Storm, she siphoned energy from Dain to Brennan to save Mira—marking her growth from a vengeful cadet into a crucial ally of the Revolution.

Physical Description

Body & Build

  • Rebellion relic winds around her arm.

Hair

  • Blond

Eyes & Skin

  • Sky-blue eyes.

Clothing & Gear

  • Standard rider leathers.

Powers

Lesser Magic

Through her bond with Thoirt, Sloane can perform lesser magic. This includes manipulating mage lights, moving with enhanced speed, and interacting with objects such as doors and runes.

Signet

Siphoning: Sloane is a siphon meaning that she can absorb power from other sources—including dragons and riders—and then imbue it into something or someone else. As a siphon, she can also imbue power naturally, a rare ability among riders.

Abilities

Imbuing

Sloane is capable of placing absorbed power into objects, leaving it in stasis. This ability comes automatically to siphons, setting her apart from most other riders.

Relationships

Liam Mairi Her older brother, whose death deeply affected her. After their parents were executed, the two were separated, and the letters Liam wrote to her from Basgiath became the only pieces of him she had left.
Violet Sorrengail While Violet Sorrengail was quick to offer help when they first met, Sloane Mairi blamed her for her brother’s death and was openly hostile, at first refusing to serve in the same squad.
Dain Aetos At first, Sloane resents Dain, blaming him for Liam’s death, and their interactions are tense, especially during Xaden’s signet sparring class. Over time, however, their relationship shifts; in Onyx Storm, she uses her siphoning signet to channel his power into Brennan to help save Mira’s life. The moment highlights their growing trust and the possibility of deeper feelings, with their bond carrying an undercurrent of implied romantic tension.

Dragon

Thoirt

Sloane is bonded to Thoirt, a red daggertail dragon. Fierce and loyal, Thoirt mirrors Sloane’s determination and stubbornness. His presence grants her the ability to channel lesser magic and helps amplify her rare siphoning signet. Though not as frequently spotlighted as other dragons, Thoirt’s bond with Sloane underscores her strength and resilience as she learns to step out from the shadow of her brother Liam.