Coven of The Dark Creed: Background?

I'm currently building a Haemonculi coven army and really like the symbol of "The Dark Creed" Is there any official background on this coven? If there isn't any then maybe for "The Ebon Sting" ?

Have been googling my ass off but failed to find anything so far. A pointer in the right direction would help me a lot in getting more connected with my army.

Thanks in advance!

http://wh40k.lexicanum.com/wiki/The_Dark_Creed#.Ugo_sm0pV8s

That's all the Lexicanum has to say.  If you can't find anything else, it's yours to craft. Just like how GW has named a ton of Imperial Guard regiments but never given most of them anything else. I've seen some pretty cool regiments that had no background but names were from the codex.