The greatest tank battle in the history of the Horus Heresy! As the Warmaster's campaign of galactic domination continues, Horus' generals seek out fresh battlefields to conquer. After leaving the Crone World of Iydris behind, Perturabo strikes for Tallarn. A bitter, vengeful primarch, the lord of the Iron Warriors unleashes a deadly bombardment against the world, killing millions but entrenching the survivors.
Broken by the destruction of their home world Prospero at the hands of the Space Wolves Legion, Magnus the Red and the Thousand Sons retreat into the Eye of Terror. Is there any way for the Crimson King to rise again? After the razing of Prospero, Magnus the Red spirited the Thousand Sons away to the Planet of the Sorcerers, deep within the Eye of Terra.
As the darkness of mankind's internecine war slowly consumes the galaxy, those who still serve the Throne are forced to fight for both their own survival and the continued existence of everything they hold dear. With the threat of the Warmaster Horus' fleet looming ever closer to Terra, if will fall to such heroes to halt the tide, but the enemies arrayed against them are powerful and the burden of loyalty is great.