Play better. There is no army the dark elves can put out that is unbeatable, and for that matter there is no army out there that is unbeatable, though, but not unbeatable. If there is one thing I hate it is people designingg lists to fight specific armies. There is a guy in my gamming group who does that. Really nice bloke but he will always build a list to fight the enemy if he knows what it is, and its just a pain. In my opinion you have lost if you take an army to specificallky beat an opponents list, whether you win the game or not, because you have had to admit that the other player is sooo much better at making list and playing the game that you can only beat him by making a list soley designed to fight that one list. Where is the challange if your army is designed soley to beat the other persons? I haven't built a list that is designed to play against one specific race let alone army list, and that is what makes you improve as a player, learning to out smart the opponent rather then just letting selection do all the work.
Hist list may be strong (and I am not sure it is) but that doesn't mean you should resort to building a list to fight it. Maybe it has highlighted weaknesses in your own list that need ironing out, in which case make your changes. I constantly tinker with my lists based on gamming expereince, its the way to hone your list to your playing style. However the best thing to do is sit down and think about how he plays his list and what its weaknesses are and how your list can best exploit your weaknesses. If the player is a mate or some one you know to some degree then ask him to have a chat with you after the game about your list, his list, what mistakes you made and how you can play better against his list. I know I am always more then happy to do so, and that the people I play against are more then happy to do so. Its like a friend of mine says, there are no powerful lists, there are just well honed lists. If you look at any GT winners list it isn't very obviously powerful, instead it has been honed to fit perfectly with the players playing style. Maybe you are loosing not because he is kicking your arse but you are deploying badly, are using a certain unit badly or simply aren't comfortable with the list you are using. Take last week end for example. I played a couple of games against my friend, both of us using our conflict London lists. I mullered him every time, but that was because that was thee first outing of his new list and he was making silly mistakes and just wasn't at home with the list as one would expect. After the games we spent some conciderable time talking together about uses for units and better deployment strategies. Heck we even swapped lists, which I must point out is a very good way of learning how to play your own list better and also how to defeat lists your are struggaling against. So please don't go and make a list specific list. Its not fun and won't make you a better player. Instead talk to him, examine and check over your list and how you use it and perhaps even try swapping armies for one game. This is a much better solution to your problem and will improve your skills as a player no end.
Hang on, I have an idea. Write your list out for me, give us a little info on how you play and how you use the list and I will do my best as a Druchii player of some years to help you out and we will see what we can do from there. It maybe your list could do with some tinkering or it may be that your list just doesn't suite you, but its more likely to be you could use it even better! Oh, also, if you could let me know how he plays his list as well that would be great.
Cheers,
Ras
EDIT: Just re-read his list, and I am not impressed. Its fairly week with lots of mistakes and wasted points, you should be able to beat that with any empire list you have floating about. The magic is the only strong part, but it comes at an expensive price, and you should be able to neutralise it. May I ask ifhe took any Dark magic casters, because if he didn't your laughing. The Cult is a very hard list to make very powerful odly enough. It has expensive units and characters and suffers from a lack of chariots and core cavalry. I can think of plenty of cult list that would be much more scary to an empire list...
