As a Dark Eldar player one of the primary things I am always looking at is how Eldar can work with allies.
So today I am just going through some of my first thoughts on this, as I think the Eldar can really plug up a few of the glaring holes their Dark Kin have. What stands out for me almost immediately is that is that Wraithguard in a Wave Serpent just scream, use me. Of course in the fluff, we had the Iyanden craftworld aided by Dark Eldar simply because the Dark Eldar found their pursuit into Necromancy amusing. So what a fit.
Tough units in a tough transport that lay down tremendous amounts of fire power, at S10 AP2. All things Dark Eldar wish they had at this moment..