Ortevian Heresy

The Ortevian Heresy was an Imperial campaign carried out by elements of the Hammer Guard Space Marine Chapter in Sub-Sector Solaritus at the close of the 40th Millennium. This campaign is notable for the corruption of some of these Hammer Guard elements, which would lay the seeds of corruption from within, that would later blossom..bearing rotten fruit.

History
As the 40th Millennium began drawing to a close, the Hammer Guard actively deployed their Chapter across battlefield after battlefield, stretching themselves thin in an attempt to combat an increasing number of xenos and Chaos attacks on worlds around Sub-Sector Solaritus. This action would have disastrous consequences after the 2nd Company took part in a battle against the Forces of Chaos, isolated from their chapter. With his company forced to engage the deeply-entrenched foe, Legate Hadrianus Ortev would launch a daring strike into the heart of the enemy, and would eventually engage the enemy commander with only Sunwielder Nonus Fabia at his side.

During the fight, the two would be corrupted by the lies of the commander, a corruption that would later take hold of them and spread through their company. This treachery threatened to be the chapter's downfall when it was discovered by Sacerdos Thracius Decius, as the 2nd and 7th Companies fought to liberate a Hive World. Knowing the corruption had taken them, Thracius took the 7th and slaughtered the 2nd Company, purging the taint. This action would gain the attention of the Inquisition, who would launch an investigation that the Hammer Guard solemnly complied with.