Purging of Arachiana
The Purging of Arachiana was a battle of the Great Crusade.
Waged in 858.M30 shortly after the discovery of Lorgar, the campaign saw the newly christened Word Bearers tasked with the destruction of the Cult of the Iconoclast on Arachiana. The cult worshiped the 'One True God' described as a dark entity similar but distinct from the Emperor. The tenets of this religion were later incorporated into the Book of Lorgar.