possible Fluff

i have an idea i would like to pursue for my Fluff, but is there anything in the new codex saying WHERE asdrubael Vect went? i want to put a spin on the dark eldar race by trying to introduce LOYALTY(not like the SM) but like following a leader who has proven over and over that they can succeed, any idea's or questions please ask

I've done something among the lines in my Kabal's fluff, they follow the Archon because he held together a dying kabal and gave it new life, they aren't 100% loyal, but since the kabal is all about grow through show of power and followers rather than a lucky death. They kind of look down at back stabbing, since anyone can do it, to actually get people on your side and then confront him you gain some power.

thanks Aeterna, if i can think of a base story for my fluff i'll post it here