As one of the illustrious Crusade Host, Brother Crius resided on the soil of Holy Terra as a representative of the X Legion. But when he learns that his beloved Primarch Ferrus Manus has died at the hands of traitors, his stoic, mechanical grief gives him the strength and determination to go on a special mission for Rogal Dorn himself. Reaching to the stars, he searches for any sign of his lost Iron Hands brethren in the hopes of bringing them back to Terra to aid in the final defense of the Palace. The question remains open: who exactly survived the massacre at Isstvan V and what has survived from them to this day?