Right, had a games agaisnt Dark Eldar. The two oldest books dueling it out...or something. Anyway, We played a battle mission book and got Waaaagghh! (Multiple objectives essentially, with some extras which didn't really come into play). With the Dark Eldar playing the role of the Orks. Why not?
My list was...
Lord w/Viel and Orb.
Two squads of eight flayed ones.
Three units of eleven necron warriors.
One unit of nine or eight scarabs.
Two units of three destroyers.
One monolith.
Two Tomb Spiders.
His list was.
Two Dark eldar lords, both with drugs and an assortment of terrible things I cannot fantom.
Two large squads of Wyches with Agoniser leaders in Raiders (One gets always strike first, other gets +1 attack).
three squads of Warriors in Raiders with blaster and spinter cannon.
Two ravegers with three disintigrators.
All skimmers have night shields, all the raiders have dark lances.
So, he deploys first, rather conservatively in the top left quarter. I deploy (mostly behind) the monolith and terrain in my bottom right. Scarabs deploy to my left flank (hopefully spread him out) and the Flayed ones infiltrate to the top right flank (to encourage the spreading of his forces).



Turn 1.
My opponent got the first turn (as he would 5/6 of the time in this mission). The ravagers stayed back, while one wyche raider and two warrior raiders skimmed over near the scarabs, one warrior squad disembarked. One warrior squad zoom-zoomed over to my Flayed ones. Everything else sort of chilled out. Something important to note, both the Lords are with wyches.

In the shooting phase, one ravager opened up onto my painted flayed ones unit, melting a couple (they fall over), while the other opens up on one of my warrior squads, and vaporises the whole lot of them (

). besides that, raider and warriors shoot my scarabs and kill a couple of bases.
In my turn, six of the dead warriors get back up, while one of the fallen flayed ones stands back up. I shuffle my phalanx towards the middle of the table. Keeping a keen eye to use the building to my right and the monolith as LOS blocking terrain. Scarabs inch closer to the warriors/raider near them, while the flayed ones keep rushing up the top of the table. The destroyers start off the shooting. One group stun a raider in the top left corner, while the destroyer to my left flank destroy a raider near my scarabs, the monolith then particle whips the squad down to only a handful of models. The scrabds charge the remaining Warriors from the wreakage and kill 'em all.

Turn 2.
One wyche raider turbo-boosts right next to my Monolith, while the other boosts near my scarabs. One ravager fires into the destroyers, knocking out two of them, while the other fires into the Flayed ones again, however cover is in my favor and I suffer no wounds. The warriors on the gound fire into the scarabs again, and I loose one wounded base.


The wounded destroyer get funneled through the Monolith, and launch to the middle of the table, while the second group has the scarabs fall back and create a living shield around them to deter assaults. The Monoliths Flux arc wrecks the Wyches raider, while the destroyers on the left flank destroy an empty raider. The teleported destroyers wreck the last warrior raider, whose occupants are then charged and killed off by the flayed ones (thank god for move through cover on them).
Now all I needed to worry about was an entire unit of wyches in my lines...



Turn 3.
The wyches near the Monolith sneak by, and charge the Tomb Spider, to no real effect. Ravagers continue shooting into the Flayed ones, to no real detrimental effect.
My lord Veils his squad next to the dark eldar warrior squad, and then the rapid-firing shots from the Lord and around sixteen necron warriors kills them all. The other warrior squad backs away from the wyches and tomb spider. Flayed ones assault both ravagers and shake them both.



Turn 4.
Ravangers both boost away from the Flayed ones, while the second wyche squad disembarks near the Lord's warrior unit. Needless to say, the wyches and Dark Eldar lord make short work of my warriors and lord and run my squad down.
In my turn, one flayed one units heads to the middle of the board, while the other keeps chasing the ravagers. The tomb spider finally falls to the wyches in combat.

Turn 5.
The dark eldar lord uses drugs to assault my Flayed ones, however they loose only one model, and kill the Necron Lord. The Wyches in my back lines botch up their difficult terrain rolls and fleet rolls and end up stranded in front of my lines.

Monolith and my warriors all shoot into the Wyches squad, leaving only the Lord alive (albeit wounded.)
Turn 6.
The Dark Eldar Lord charges my Necron Warriors, but doesn't really do a whole lot before I kill it. However the ravagers and Wyches kill off the rest of the Flayed ones which drop my to my Phase out point.
In my turn, I phase out. The Dark Eldar Waaagh thus continues unabated, even after the Heroic efforts of the Necrons.