Extended universe

Gunmetal Olympus is a shared universe, created by Maria Ying with The Persephone Trilogy along with various short story collections such as Memory of Olympus. In addition, various other authors have self-published works set in or based on the setting.

Cirice Gray

Main article: Cirice Gray

Cirice is the author of the Sisters of Meténeion series, focusing primarily on the young mortal acolyte Madalithea. Maria Ying co-authored the second entry, House of the Underworld, and Madalithea appears in The Persephone Effect.

Callisto Khan

Main article: Callisto Khan

Callisto is the author of The Zeus Constant, a sister novel to The Hades Calculus focusing on the titular god; since its release, it has been described as "dubiously canon" in regards to continuity with later additions to Ying's works. She also wrote A Weed in the Flowerbeds, a short story appearing in Memory of Olympus.

After the release of The Zeus Constant, Callisto became part of the shared pseudonym Maria Ying. Her first book under the name was The Persephone Effect.

Tris Husband

Main article: Tris Husband

Tris is the author of The Pink Diamond and Keeping The Peace, starring private detective Isadora.

Luna Selvin

Main article: Luna Selvin

Luna is the author of the short story A Drone's Domain.

Sadhbh Frost

Main article: Sadhbh Frost

Sadhbh is the author of the short story The Fundamental Order of Elysium.

Autumn Wolff

Main article: Autumn Wolff

Autumn is the author of The Little Owl Flower Shop and A Network of Roses.

Emmeryn Palladino

Main article: Emmeryn Palladino

Emmeryn is the author of The Medusa Terminus.

Amber Jayne

Main article: Amber Jayne

Amber is the author of the Giantslayer Trilogy, starring the demigod Alcippe.