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I am digging the Infernal Tetrad (I know, I know...yet another 'Tetrad' list of the apparently many that are currently proliferating), but also want to try squeezing in a Chaos Knight. Here is my stab:

Infernal Tetrad (Primary Detachment)
-DP T: Flight, 2 Greater, 1 Lesser, Impossible Robes, ML3, Warlord
-DP K: Flight, 2 Greater, Scorn
-DP N: Flight, 2 Greater, 1 Lesser, ML2
-DP S: Flight, 2 Greater, 1lesser, ML2

CSM AlliedDetachment
CSM CAD
-Sorcerer: ML1, Force Axe
-Cultists x10
-Cultists x10
-Chaos Knight Paladin: Tzeentch (my local uses ITC ruling on this), Dirge caster

That is a 160 pt tax in order to get the knight squeezed in...Which I reckon is the second cheapest (135 for an Daemons CAD...But I don't really want to use Nurglings).

Does this list sound doable? The knight gives some stability to the rather random nature of the prince formation, and it sounds like fun. The other option is to bring in a fully kitted-out Helbrute Mayhempack, which probably doesn't have the same ooomff (but sure nails a 'low model count' army).

There's no Lord of War slot for an Allied Detachment. Either have to get more cultists or do the Daemons CAD with nurglings.

Let us know how it fares!

And another dream comes crashing into reality. Thanks! I will update the op.

and what do you think to do with 8+d6 WC only? DP need psyonic , sometimes you cant glide and get into CaC you need swoop and cast spells...to boost yourself or summon or cause damage, for me 8 WC is not enough.

Edit: NEVERMIND this post. Renegades can't take a chaos knight as a LOW.
Thinking about it, the absolute cheapest way to run a CAD for Chaos is to use Renegades and Heretics. It would cost 105 points for a command squad and 2 10 man mutant squads. You'll lose a Mastery Level but you can use those saved points to get your other princes back to ML3 thus giving you a net gain of 1 warp charge.

You probably won't need the dirge caster on your knight. Overwatch has rarely been a problem for me with my Tetrad armies. You can trim those points.
If you are looking to trim points, you can probably take the lesser from the Nurgle and Slaanesh princes. I also think that warp armor on them is nearly a necessity.
The question you really need to ask is this "What value does your knight give?" The knight plus prerequisite tax is very heavy.
The biggest problems for tetrad lists, in my games thus far, are wraithknights and stormsurges. Sometimes a prince will get bogged down in a prolonged combat that takes a long time to clear out -- like 20 khorne dogs or 100 FNP orks.
If a knight can help to clear those out more quickly, then it's worth it. If not, then there might be better solutions to handle those problems.

Edit :
The reason you see a lot of people taking a CAD with the Tetrad (including me) is to grab extra FMCs like Be'lakor. If you don't care about those, then you can just grab another formation from the Wulfen book. A Forgehost, Burning Skyhost, GoreThunder Battery, Rotswarm, or Grand Cavalcade. Any of those would be a good fit, though I would personally go with the skyhost, rotswarm or cavalcade.

Edit Twice:
Edit : I have a writeup of the Tetrad here, where I went into a deep dive about rewards, powers, etc...

I tried this, only got it to work properly at 2500pts. There just isn't enough points to squeeze both the tetrad (a formation that requires a lot of points to make work) and a knight (which is expensive on its own).

@labmouse42

how you handle maelstrom mission with tetrad with so few pieces, if you meet a gladius space marines how you can score maelstrom points and prevent him to score?

 blackmage wrote:
@labmouse42

how you handle maelstrom mission with tetrad with so few pieces, if you meet a gladius space marines how you can score maelstrom points and prevent him to score?

I'm usually playing ITC games, and the maelstrom scoring is much easier there than in the BRB. Getting "Kill a Unit" is a pretty easy to achieve. Hold X objective works if it's one in my deployment zone I have 10 plaugebearers or horrors sitting on. Getting into the enemy deployment zone is not usually that hard, it's just a matter of where you consolidate in.

The worst game was when I dove all 5 princes (including Be'lakor) into a green tide with a painboy. The primary was KP, the secondary was malestrom. I won primary, as I killed the tide by the end of turn 5, but lost Malestorm, and then won on tertiary.

I've not played against a gladius list yet. My plan would be to keep my princes grouped to be able to at least earn my 2 points per turn. I know I would not be able to keep them for scoring, so long as I could keep up and then plan to win on secondary or tertiary.

i just cant fit Be'lakor at 1750 points so i m going for Tz herald with paradox, i cant find a way to put be'lakor into my list.

 blackmage wrote:
i just cant fit Be'lakor at 1750 points so i m going for Tz herald with paradox, i cant find a way to put be'lakor into my list.

At 1750 you can fit him in if you go CSM allied detachment with just 10 cultists.

Edit: Should also work just fine with 2x Nurglings and Be'lakor too. That is 440, which gives you 1310 to build your princes with.

i dont think you can take allied+formation, i think you need CAD, so maybe 2nd option is viable

 blackmage wrote:
i dont think you can take allied+formation, i think you need CAD, so maybe 2nd option is viable

As long as the allied detachment is not the same faction as the primary detachment it's legal.

 blackmage wrote:
and what do you think to do with 8+d6 WC only? DP need psyonic , sometimes you cant glide and get into CaC you need swoop and cast spells...to boost yourself or summon or cause damage, for me 8 WC is not enough.

3 Shrieks, Shrouded, possibly a summons. Yeah, it's definitely lighter than wanted, but hopefully the knight would be enough of an offset to this.

@labmouse42: that's an excellent write-up that opens my eyes to quite a few nuances. Thanks for sharing.

 Thantos Kalev wrote:
@labmouse42: that's an excellent write-up that opens my eyes to quite a few nuances. Thanks for sharing.

Thanks man. Glad to you got a good use out of it.

If you want to tell me your experiences I'll be happy to add them to the document so others can learn from your experiences as well. Many other people on this site contributed their knowledge to it as well.

Got to love the 40k community eh?