Siege of Orimus

The Siege of Orimus was the first recorded Imperial campaign conducted by the mysterious Invokers Space Marine Chapter upon the besieged world of Orimus. During this campaign, the Chapter faced one of its toughest trials, suffering the tragic loss of their first Chapter Master.

History
When the Imperial world of Orimus fell under the corrupting influence of the Ruinous Powers due to the mysterious activation of an unknown Warp Gate, the newly created Invokers Chapter was dispatched by the High Lords of Terra to cleanse the planet of this taint. This would be the First great trial of the Invokers. It would be during this campaign that the Invokers would first display their undying hatred for Chaos in all its forms. The world was brought to heel in short order, but not before the Invokers lost their first Chapter Master Belial Marce, who valiantly sacrificed himself to buy his brothers enough time to escape the hellish confines of the hive city, before the thermal charges they had laid at the heart of the warp gate, were remotely detonated, cutting off the malefic influence of the Ruinous Powers and banishing the summoned legions of daemons.