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Basically a combined force like the new demonkin mini-dex.

CSM loose the abilities to take any Slanesh marked troops (for obvious reasons), also no Demon-princes or named chars aside from Fabius Bile (ascended Champions of the dark gods have better things to do than mercenary work).
Dark Eldar stay mostly as is.



Problems/Questions:
- the biggest change is probably that CSM gain acces to cheap assault vehicles; does anybody have any experience how this affects the game?
- as far as I can tell, most rules are written specifically so that they don't affect units from other codizes (e.g. power from pain, combat drugs are handled model by model), is there any obvious abuse potential here?

I'd say the biggest flaw is in the fluff. Dark Eldar hagte Chaos, in all it's forms. This relationship is already represented by desperate allies. You'd have more luck fluff wise of an Ork/Chaos alliance, at least that makes sense.

Fluff is pliable if anything.

DE and CSM locked in a competition of who can inflict more pain is the fluff.

DE is Emo/Goth and CSM is Punk Rockers. Mainstream of The Imperium of Man sees them all as heretical deviants.

DE is Sadist CSM is Masochist

Read the Novel Blood Gorgon and how 1 Slaanesh Marine enslaved a DE as his b1tch.