A companion piece to the Primarchs novel Hammer of Olympia, Guy Haley’s short story The Emperor’s Architect is an interleaved tale combining glimpses of Perturabo’s earliest days with a Crusade-era story of two Remembrancers attempting to write the definitive history of the Iron Warriors’ primarch. Until now the Lord of Iron’s story began on the Phyrgean cliffs, but here we see Perturabo’s first days on Olympia and his earliest, almost-forgotten interactions with humans. Meanwhile Olivier and Marissa LeBon’s unusual mission provides a personal drama tackling faith, relationship troubles and different perspectives on the truth as they delve into Perturabo’s complex and challenging character.