41M the Jade Dragons were destroyed by the force of chaos and the betrayal of Chief Librarian Skaldan Duelgun. For years, unknown to the chapter Skaldan had been affected by Frost Blight a terrible disease that physically mimics the effects of frost bite on the flesh and slows the bodies functions. It's unknown how he escaped notice for so long. But it is suspected that the 3rd company commander Ulric Fergus was involved. Skaldan subtly corrupted the men under him and allowed unfit recruits into the ranks of the chapter.
The 1st company commander Lachlan Reman began to suspect that something was amiss when he accidently scanned a squad of new recruits with his Eye of Omissiah only to find that they had an unsually slow heart beat.
After informing the Chapter Master Sholto Morag the entire chapter was recalled back to Neptunus Prime IV for re-evaluation with the co-operation of ordos hereticus inquisitor Abraham. it was here that Skaldan reveal himself and the chapter was split usunder.
a 2/5 of the Chapter had been affected by Frost Blight and were the thrall of Skaldan.
another 2/5 were selfish renegades.
it was only by the combined efforts of the 1st and 7th Companies with the aid of the Neptunus Sector Defence Forces and the Order of the Cleansing Tear that the rebelion was quelled. But at a terrible Cost...
Rise of the Purifiers
The Jade Dragons were declared Excommuticate Traitoris.
Sholto Morag blamed himself for the fall and offered himself for execution providing those still loyal were spared.
In an act of penance the remaining loyalists removed their shoulder pads and burned them.
Lachlan Reman was renamed Master of the Purifiers and all companies adopted the Red and Grey of the 1st Company.