Need help for list

Since I like pretty much every xenos army (specially DE ) I'd like some help and some suggestions on making an awesome army (limit of 2500 points) containing every alien race.

I hope I'm not asking for too much.

Officially the rules wouldn't allow this.

So, what type of house rules are you going to be using? Are there any? I'd like some guidelines before I'd attempt a plot like that.

The people I play with don't care what I play with.They don't care if I use 3 or 4 different armies but they do care about special rules and the main rules

Basically I can put anything ( but I don't think they would allow me to use more than 4 armies)

Well, let's see;

Xenos Armies
Orks
Eldar
Dark Eldar
Tau
Necrons
Tyranids

If we're only picking 4...well, we can't do all, so maybe pick the 4 you like best?
Also, are you looking for the army to be flavorful, or are you looking for it to be functional?

I have dark eldar so one has to be out.....
I don't really know the strong points of the other armies but i want it to be functional

I like this idea and id like to play against it. My vote is these 4:

Dark Eldar obviously

slave soldiers:
Orks
Tau (kroot)
Tyranids (tervigons, gants)

OR if you going more for broken then DE, eldar, tau, crons.. man I hate to even imagine what dark army would arise from that alliance.

Oh good lord that would be amazing

So DE and tyranids for sure. What else would go well that would break the game?

If I was going 'break' I wouldn't be bothering with Nids - Crons and Deldar with maybe a spattering of Tau would be my method.

right so...where do i start?
im thinking starting with necrons

Necrons, annilation barges are insanely good as are their night scythes. Take imotek the storm lord and keep night fighting in effect for the whole game!

Depending on how they house rule this, Imotek's lightning would hit your own units as per the most recent FAQs.

There is that but its only a 1 in 6 chance of hitting, could try a solar flare instead to turn night fight back on at the end if each shooting phase.

Imotekhs lightning does hit friendlies so he's a no go. I've tasted that 1/6 enough to know its too deadly to risk. Anni barges and scythes, beast packs, kroot, marker lights, podsides, Helios suits, velocity trackers, eldrad,.. Ugh ill stop there.

warriors are always better than immortals, unless your using a cryptek to teleport them around.

Basically your looking at Anhilation Barges and Night Scythes. Throw in a Farseer and maybe Pathfinders from Eldar for psychic defense and objective holder, and then some tau for markerlights (if you allow other races to use their markerlight bonuses) and bam... instant win

i will return the necron warriors and get a Pathfinder Team then