In reading order
Roboute Guilliman: Lord of Ultramar
David Annandale
Leman Russ: The Great Wolf
Chris Wraight
Magnus the Red: Master of Prospero
Graham McNeill
Perturabo: The Hammer of Olympia
Guy Haley
Lorgar: Bearer of the Word
Gav Thorpe
Fulgrim: The Palatine Phoenix
Josh Reynolds
Ferrus Manus: The Gorgon of Medusa
David Guymer
Jaghatai Khan: Warhawk of Chogoris
Chris Wraight
Vulkan: Lord of Drakes
David Annandale
Corax: Lord of Shadows
Guy Haley
Angron: Slave of Nuceria
Ian St. Martin
Konrad Curze: The Night Haunter
Guy Haley
Lion El'Jonson: Lord of the First
David Guymer
Alpharius: Head of the Hydra
Mike Brooks
Mortarion: The Pale King
David Annandale
Rogal Dorn the Emperor's Crusader
Gav Thorpe
Sanguinius: The Great Angel
Chris Wraight
Sons of the Emperor: An Anthology
Aaron Dembski-Bowden, Nick Kyme, Graham McNeill, John French, Dan Abnett, Gav Thorpe, Guy Haley, L J Goulding
Blood of the Emperor
Nick Kyme, Graham McNeill, Chris Wraight, David Guymer, Andy Clark, Mike Brooks
Morningstar
Graham McNeill