Khârn: The Eightfold Path (Black Library Advent Calendar 2013 #8)

In the fighting pits of the Conqueror, Khârn and his fellow World Eaters compete in ever-bloodier contests of carnage and mayhem. As the Butcher’s Nails dig ever deeper into their brains, the Legion have forsaken the Crimson Path. Now they walk a darker, more dangerous road: the Eightfold Path.

A Horus Heresy audio by Anthony Reynolds