I discovered my humble blog received some attention on another blog, warhammer39999. I'm very grateful for the mention, and it made me realise I have yet to post some background material on my army. So for all you fluff-buffs, here is some history on the chapter!
In the ancient Librarium vaults of Terra, beneath adamantium walls a hundred feet thick, sealed with hexagrammic wards and atomic blast doors, lie those records whose content would drive the common man insane and shake the foundations of the Imperium should they be known to others than the most faithful of men. Among the heretical works of the Ruinous Powers, arcane tomes of forbidden sorcery and blasphemous xenos texts fortelling the destruction of mankind are stored documents written by the Administratum itself in recent times, documenting the most atrocious crime known to man: treachery among the Emperors' space marines.
The last time the vaults were opened, one new file was added to the mountains of unholy knowledge stored therein, detailing the betrayal and destruction of the Storm Dragons chapter of the Adeptus Astartes.