Editing Age of Sigmar/Tactics/Old/Chaos/Hosts of Slaanesh (section)

==Army Building==
'''Battlelines:''' Well, you don't have a choice. It's Daemonettes.

First thing, how many units do you want? 2 is the minimum for Vanguard games and a good place to start, but you may want to skip directly to 3. 
Why? Because of the Battalion, the Daemon Cohort of Slaanesh. You may think that that Battalion is nothing fancy; you already have high speed, and the bravery test thingy is unreliable at best. And you'll be right. But when you see how cheap it is and then remember that each battalion offers you an extra relic for your army and the invaluable ability to deploy all those units as you like, it becomes far more interesting. 
Also, 3 battlelines are required for bigger games, so better start pointing in that direction.

How big the units? Daemonettes get a nice bonus if they are 20 or more for sure... but looking at it closely it isn't paragonable to what other battlelines gets (it's not like you get extra attacks like Skeletrons). The bonus is nothing to spit at, but also nothing to write home about it.
So, in general, making units of 30 daemonettes just to be sure you'll get in melee with that bonus is mostly overkill, especially considering the difficulty to pile in all those models.
20 is the most solid option. It's cheaper, you'll move around easier, most of them will have a chance to attack, and most of the time you'll get to use your bonus anyway.
10 is too little for a simple fact: Daemonettes are GOOD. 
We are still talking about one of the finest battlelines in the game, why would you want to go min size?

'''Leaders:''' A Keeper of Secrets is basically a must-have. His command ability is the main tactics for the Host of Slaanesh. You can go Chaos Lord if you want mortal allies (aka Slaves of Darkness), but the Keeper of Secrets ability works on every unit in the Host. The bad news? The model is old, and it's a common opinion that it sucks.

What else? Heralds.
All Heralds are good, so choose your favorites.

Just remember a couple of things:
* If you choose the standard Herald, remember that there is no penalty whatsoever to give her a Steed... except there is no proper model.
* If you want a Herald on foot anyway, the best way to get it is to avoid the overpriced resin kit and instead buy an Hellflayer Chariot. Inside you will find an extra head and a body, which the instruction manual clearly states you can use that to make your Herald (which is weird from GW, but nice). So, for a few bucks more than the resin kit, you get a free Hellflayer. Who needs a Start Collecting? Don't you like the Hellflayer? Take an Exalted Chariot and get 2 free Heralds. You're welcome.
* "But I really want Herald on Steed, anon!" Ok then. Buy an Exalted Chariot, make a Seeker Chariot and use the 2 leftover armored steeds plus the bodies and heads to make 2 Heralds on Steed. You still get 2 mounted characters for less the price of one of those new fancy plastic characters, so while you are throwing away a lot of stuff on the sprue, it's not bad money-wise.
* You can't go wrong with Heralds on Chariot, whatever you choose the small or the big one. Unless you have more than one and you want a big single unit or you already filled all you Leader slots, consider always running your chariots as Heralds. For a few points, you get some nice extra attacks, a nice little malus to be hit by enemy HEROES and, most importantly, they trigger the Loci of your units. 
* Don't look at the Compendium for the rules of the Daemons of Slaanesh. Pick the proper PDF or the Grand Alliance Book. There is a subtle but important difference. In the old rules, units get their Locus if they are within range of a DAEMONETTE HERO, while in the new rules they get the Locus from any DAEMON HERO of SLAANESH. This means you get now the bonus from the Keeper of Secrets, the Lord of Slaanesh on Daemonic Mount and even the Daemon Prince. If you don't want Heralds, you can live without them.

The Lord of Slaanesh on Daemonic Mount and the Chaos Lord of Slaanesh are there if you want to play with the Slave of Darkness. They are still a solid option for a hero, especially the first one which can trigger the Loci, but it's clear they are meant for a more Mortal based army than the Host. If you are running a lot of Hellstriders, they become more valuable and can replace the Keeper of Secrets (but again, the Lord on Daemonic Mount is the only one that can keep up with the Hellstriders).

'''Others'''
Well, here's come the juicy part.
You want the Seekers of Slaanesh. Those girls are amazing, and you can't go wrong with them, especially using the...

*'''Hunter Seekers Missile:''' A terrible pun to name a combo which uses, spoiler alert, Seekers. This is, for now, the most frustrating tactic you can unleash on your opponent with this faction. Take a Keeper of Secrets, give him (if you choose instead of rolling, of course) the "Lord of War" command trait. Take a unit of Seekers (10 women strong is enough) and deploy both of them last, where you know you can hurt the enemy. In the Hero phase, declare the Seekers the beneficiaries of both the Command Ability of the KoS and the Command Trait. Cast some Mystic Shield on them too. Now throw the seekers where it hurts more. With their absurd speed they will have no problem charge where you want them to charge. You now have these girls hitting on 3+, generating more attacks on 5+ and making two combat phases. Just make sure they can survive the counterattack between the two attack phases (Mystic Shield will help). The best part? It's cheap, so you can easily keep another unit of Seekers and do it again next turn. This combo loses much of its punch once the enemy has seen it, and will put some meat shields in line in front their valuable units next time. That's where you need to get good at the game and use it intelligently.

*'''Arch Double Pile in (if you know what I mean) :''

Take Seekers alliegance option, Archaon, Slaanesh Chaos Lord on Daemonic Mount with artifact to take back command point on 5+, Keeper of secrets, Cogs endless spell and full daemonettess. Watch enemy heroes bleed, summoning spam and one turn charge of raping daemonettes.