Legion of Avarice

Pre-Heresy
The Space Marine chapter known as the 'Sons of Phthisis' were created around mid to late M37 and were a successor chapter of the Ultramarines, as most chapters are, and declared the moon of Phthisis which orbits the gas giant Coinos in the Peleregon cluster in the north of the galaxy as the chapter's homeworld. the chapter quickly established itself within the Ultramarine successors and gained a reputation for their experience and skill of fighting in flat open areas, often on barren moons and open plains usually against xenos, particularly the orks and were used by Imperium forces to take out large ork clans causing problems in nearby regions.

Their colour scheme was cream with purple chest, helmet, lower legs and fists. The symbol of the Sons of Phthisis was the Greek letter phi upon a cream background.

The Battle of Phthisis
In 093.M38 an average sized Waagh led by warboss Gutshott converged on the chapter's homeworld Phthisis and began to land en-masse. the Sons of Phthisis called for aid and an Imperial Fists contingent led by 6th company captain Diordon came to their aid. About half of the Sons of Phthisis had set up a blockade outside of the moon but ork ships were drastically slipping through. After 5 days of fighting the Imperial Fists arrived and joined the Sons of Phthisis in orbit against the ork fleet.

As more and more orks landed and the forces on the surface looked lost the Imperial Fists saw this as an opportunity to stop the Waagh there and then and without consulting the Sons of Phthisis' chapter master Phobire, Diordon decided to bombard the entire moon to wipe out all of the orks on it however it would also mean the destruction of the remaining space marines on the planet. The remaining ork fleet disbanded and the Waagh was over.

Knowing how outraged the remaining Sons of Phthisis would be, Diordon immediately went to consult the Chapter Master Phobire upon their flagship vessel the 'Jewel of the Stars' and to offer them the Imperium's comfort. Phobire however wasn't convinced and felt so betrayed at the Imperial Fists that they didn't consult him on the decision to destroy his chapter's homeworld that he murdered Diordon and ordered his fleet to open fire on the Imperial Fists.

They defeated these Imperial Fists forces taking a third of their ships and destroying the rest. They were now traitors to the Imperium and fled the system before a larger Space Marine force was sent to wipe them out.

Fall to Chaos
For the next 90 years the traitor chapter roamed the north of the galaxy fighting various forces of the Imperium and other xenos but due to their heavy losses at the Battle of Phthisis they only attacked to re-strengthen themselves and to build up their fleet now that they had no homeworld.

During a raid on a cultist city on the planet of Brarvis IV Phobire came across a Slaaneshi shrine where he found a beautiful ancient sword the inhabitants of the city owned and decided to use it for himself. Little did he know that the sword was in fact a daemon weapon containing a powerful daemon of Slaanesh. It slowly turned Phobire towards the will of chaos and hence a new warband was founded: the Legion of Avarice who wage war against the Imperium for their betrayal.