Shadow Vipers

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The Shadow Vipers are a Renegade Chapter of Space Marines operating in Ultima Segmentum. They are believed to be descended from the Imperial Fists and were declared traitors in M36 shortly after being corrupted by Slaanshi forces from their battles with a warband of Emperor's Children who invaded the Heliosian sub-sector.

History
The Shadow Vipers were founded during the 10th Founding and originate from the Imperial Fists Legion and were said to be, the chapter was given the world of Helios located in the Heliosian sub-sector to be their homeworld. For much of their early history they spent the time defending the sector, and other sectors around it from xenos incursions. Their first large scale battles being with a warband of Emperor's Children that invaded Sub-Sector Helios, despite being victorious during the conflict the Shadow Wolves were corrupted by Slaanesh and turned traitor shortly after their conflict with the Emperor's Children.

The Heliosian Sector Conflict
During 131.M36 Sub-Sector Helios was invaded by a warband of Emperor's Children led by Damas Axalian who was captain of the 29th Company of Emperor's Children. The early battles of the conflict were in the Shadow Vipers favour as they managed to successfully push back the first assault groups of Emperor's Children. However the conflict took a turn for the worse when Axalian decided to attack Helios directly and managed to successfully summon a Keeper of Secrets to assist him in his assault of the Shadow Wolves homeworld.

Soon madness was running rampant in the PDF forces fighting alongside the Shadow Vipers and the Shadow Vipers themselves struggling to resist the temptations of the Keeper of Secrets. The Shadow Vipers would eventually managed to defeat the Keeper of Secrets and kill the Chaos Sorcerer responsible for summoning it alongside Axalian, the victory however would be short lived and at a terrible cost. The battle with the Greater Daemon would leave a lasting scar mentally on the Shadow Wolves Chapter Master Sorias and many of the Imperial forces involved in the battle.

Fleeing Helios
With many of the PDF and high ranking civilians on Helios turning to Slaanesh worship amid the aftermath of the battle with the Emperor's Children Sorias decided that the Shadow Vipers Chapter too would dedicate themselves to She Who Thirsts. The Inquisition having heard about the Emperor's Children excursion into the sector decided to dispatch forces to the sector after hearing rumors of Chaos influence having a lasting effect there. Sorias and his forces aware that the Inquisition was coming to investigate the sector decided to get together every resource and follower they could and abandon the Sector to the Inquisition.

Emperor's Children
After the Heliosian conflict a strong hatred of the Emperor's Children remained in the hearts of the Shadow Vipers, the chapter vows to kill more Emperor's Children to prove they are the superior followers of Slaanesh.