At the dawn of the forty-first millennium Lord Commander Macharius & his forces embark upon the re-conquest of over a thousand worlds. A man of steel & fire Macharius is the only one with the will to lead the massed armies of the Imperium to victory. As the crusade rolls onwards it reaches the world of Karsk. In the city of Irongrad the Imperial forces face the crusade's end unless Macharius & his army can defeat the dreaded Angel of Fire. What ancient perils may yet lie outside the Imperium & the dominion of mankind?