David Guymer wrote the Primarchs novel Ferrus Manus: Gorgon of Medusa, and for Warhammer 40,000 The Eye of Medusa, The Voice of Mars and the two The Beast Arises novels Echoes of the Long War and The Last Son of Dorn. For Warhammer Age of Sigmar he wrote the novel Hamilcar: Champion of the Gods, the audio dramas The Beasts of Cartha, Fist of Mork, Fist of Gork, Great Red and Only the Faithful.

He is also the author of the Gotrek & Felix novels Slayer, Kinslayer and City of the Damned and the Gotrek audio drama Realmslayer. He is a freelance writer and occasional scientist based in the East Riding, and was a finalist in the 2014 David Gemmell Awards for his novel Headtaker.

Josh Reynolds is the author of the Horus Heresy Primarchs novel Fulgrim: The Palatine Phoenix, and two audio dramas featuring the Blackshields: The False War and The Red Fief. His Warhammer 40,000 work includes Lukas the Trickster and the Fabius Bile novels Primogenitor and Clonelord.

He has written many stories set in the Age of Sigmar, including the novels Shadespire: The Mirrored City, Soul Wars, Eight Lamentations: Spear of Shadows, the Hallowed Knights novels Plague Garden and Black Pyramid, and Nagash: The Undying King. His tales of the Warhammer old world include The Return of Nagash and The Lord of the End Times, and two Gotrek & Felix novels. He lives and works in Sheffield.