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Its taken a few lists and alot of advice but I have hopefully come up with the most optimised Slannesh army for a tournament. Please be as critical as possible.

Flayertroupe
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Herald of Slannesh (Psycher Lvl 2, Loci of Beguilement, 2 lesser rewards)

6 units of 10 Daemonettes (2 units with a Icon of Chaos)


Daemon Lord
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Keeper of Secrets (Psycher Lvl 3, 2 Greater Rewards, Soulstealer, Warlord)

Be'lakor


Forgehost
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2 Soul Grinder of Slannesh (Baleful Torrent)
1 Soul Grinder of Slannesh (Warpgaze)


---------------------Tactics--------------------------------
So I intend on rolling both the Herald and the keeps on the Slannesh Psychic Table, this is due to me literally NEVER being able to roll invis or shrouded and the rest of the spells are useless. The Slannesh table has been serving me well recently so Ima keep using it. I chose warpgaze for one of my grinders because I don't have much to take out larger more bulky vehicles and the baleful torrent for more control so I dont fry my daemonettes and so I can garrentee the re-rolls and not have to hit on snapshots with my Harvester cannon. Be'lakor will be used to keep invis up on the keeper and draw some fire. The daemonettes are going to deepstrike in key areas and secure objectives.

Looks good. Let us know how it works out.

I was actually looking at the stats of the witstealer today and with the new flayertroupe rules it actually looks quite amazing if I were to use aquilesence it would be even stronger. What are your thoughts?

if i would go tournament right now (at least here in Italy) i would bring

flayertroupe
4x10 demonette
2x4 fiend of Sl
Sl herald, steed lev 2°, exalted locus, great rew
demon lord Be'lakor
5x chaos furies

CAD
Sl herald,steed 2°lev slothful claw exalted locus
Sl herald 2° lev exalted reward
2x11 horrors
15 seekers
13 WC some obj secure troops and some hard hitting units, fiends with Sl herald and exalted locus are great, invis seekers same.this is i played couple of time with decent success.

The list you reccomended really isnt my playstyle, I much prefer more monsterous creatures on the board rather than seekers, and more fiends/daemonettes. I also prefer not running my heralds with greater rewards as I find they are often wasted.

for me you lack lot of punch in that list, a SL herald wirh aether blade throw 6 AP2 hits you cant rely only on rending, KOS is nice but without hit and run, lot of armies can hold it forever in CaC.About seekers you could be right you can use 5-6 fiends more and take out them.

Lack power? I assumed the soulgrinder formation with both re-rolls to hit and re-rolls to wound would be if anything too strong for casual play and competative for tournament. I intend on giving my herald either etherblade or witstealer depending on how many armoured units they have (such as SMget etherblade and orks get witstealer) the keeper of secrets is stronger than 2 heralds of slannesh as he has automatic ap 2 and regains lost wounds

did you already played that list and if yes against what kind of army? remember also with just 8 CW is not automatic you will succesfully cast invisibility, some armies can field easily 12+ dices and without invisibility i dont see KOS so durable, face another demon for example he can prevent your casting and kill the KOS with a 2++ LOC or DP, just to make an example.i dont want look arrogant, just really want find myself find a way to field a competive SL army.

Be'lakor garrentee's invis on the keeper, I dont roll for invis on the keeper I roll on the slannesh table and play more aggresively. All slannesh spells are pretty decent whereas I roll on telepathy and never end up getting what I want.

Also with his superior stats the keeper could probably take on a daemon prince with the right spells and rewards the LoC should be a easy in comparison

LOC easy? 2++ reroll 1? you cant just touch him, same for Tz prince, what i want say against an army field 13-15 WC you risk your invisibility will be dispersed then Kos could be killed, i faced recently a Kos like that , charged by 2++ reroll 1, str8 DP and it died because invisibility was dispersed with my 15 WC, took 2 wounds from psychic scream from kairos and another from warp fire then finished by DP,maybe lucky but i m sure you could face same fate against other army, tau dont care of invisibility they bypass with markers and the mere number of shoots, same for eldar with scat bikes+warp spiders.

True, it would be difficult. Although if your looking for point value the keeper is the cheapest and is a nice cheap MC to include that can pack a punch

that is true, many years i play demons and i still find the Kos a choice just in mono SL builds, now the soulstealer gives durabilty, but still not enough, but of course in aggressive style lists it has a reason to be played. As i told i would like find a good slaanesh build but when you compare Tz with it...well you usually go for Tz in competitive enviroment, you have durabilty lot of summons, cheap defensive powers, D strenght bolts and so on...
Right now in my opinion the best two greater demons choice you can have are D thirster and Loc, the 1st one with invisibility is a killing machine which can treat anything on the table, the 2nd one with impossible robe and cursed earth/warlord trait/preiscence/grimorie is pratically unkillable.

What do you think I should add if I were to remove invisibility? In the current meta it cost too many points to use so what are some durable Daemons without invis?

durable demons without invis are usually demons of Tz, you can have a loc with 3++ (impossible robe) and easily he can go to 2++, reroll 1 is big, same for Tz DP. Another durable GD could be GUO with biomancy, sometimes he get iron arm and get T10, if you just have FNP (reward or endurance from biomancy, or new warlord trait from curse of the wulfen) he is almost unkillable.
A good way to play without invisibility is use new formations and play MSU style, lot of cheap targets, some armies just cant handle it, or throw tons of wounds on table. If you play 1-2 main threats invisibility is needed.
2 weeks ago i played a tournament with korne murderhorde and made 2nd place whitout shoot and psyonic, all matches with large delta about +3400 or delta for me at end of tournament, and tabled white scars in match 2.

I suppose maybe in this list the keeper might be reasonably viable as there are 5 targets - 3 soulgrinders, belakor and the keeper

could be, soon i will start test some Sl builds with Kos and i will see what happen with it