The Red Waaagh! sweeps across the Imperium, and none can stand against it - not even the Space Marines. For millennia, the Obsidian Glaives have defended their home world of Obstiria, but now their fortress-monastery itself - the mighty Penumbral Spike - comes under assault from Warboss Grukk's forces. As the orks swarm through the corridors of the ancient edifice, the Masters of the Obsidian Glaives open the vaults and unleash all the Chapter's Dreadnoughts in a last-ditch attempt to drive the greenskins from their world. Read it because The Red Waaagh! descends on the world of Alaric Prime, intent on plunging the sector into war.The beleaguered Imperial forces of the planet prepare to sell their lives dearly to drive back the alien tide.