Malefic Acquisition

The event known as Malefic Acquisition occurred in the history of the Invictors of Mars Space Marine Chapter sometime in the third century of the 37th Millennium, upon a newly rediscovered world, when they discovered several temples dedicated to the Dark Gods. Upon further investigation, the Invictors discovered several ancient artefacts, and proceeded to confiscate them. As they withdrew, they slaughtered their way through the planet's Chaos-worshipping population, and then launched an orbital barrage, destroying any remnants of Chaos.

History
After patrolling an unknown sector, the 4th Division stumbled upon a unrecorded world. When the marines of the division arrived upon the world would spot many temples bearing marks of all four Chaos Gods. After walking to all temples and breaking in they would steal the artifacts placed upon stone platforms. When about to leave hordes of cultists emerged from nowhere swarming the marines, Without hesitation the marine took of the planet then proceeded to bombard it until it cracked. The relics were given to the Inquisition, who would destroy them.