Imperium Secundus, ruled from Macragge by the noble Emperor Sanguinius, remains the only bastion of hope as the Warmaster's forces continue to ravage the rest of the Galaxy. Roboute Guilliman, still Lord of Ultramar, convinced his brother that Terra had fallen, but that humanity could be saved by the mysterious Mount Pharos on Sotha. However, the Lords of the Night - the merciless sons of Konrad Kurtz - have been watching them from the shadows for a long time and are preparing to strike at Pharos itself...