The proud Aeldari of Saim-Hann once sought to assist Humanity in the defence of Vigilus – a world beset on all sides by unceasing, brutal conflict – but an act of xenophobic slaughter by soldiers of the Imperium has turned ally to foe, and the warriors of the Wild Host have sworn a blood oath to exact vengeance. No-one can prevent them – no-one except, perhaps, the Ultramarines. These superhuman, gene-forged warriors are Humanity’s greatest champions, peerless masters of strategy who have defended the Imperium for millennia. With bolt and blade they assert the sovereignty of Vigilus.