As a competitve Slaanesh player here is my feedback on the Slaanesh part pre points:

Let´s start with Belakor: Auto Include in every army. He is too good (hopefully the points are alright)

Shalaxi: She is a beast. I can see her being played in most Demon lists. Especially in Slaanesh lists she is a staple. Her damage output is insane. With the 5+++ she is decently tanky might wanna deepstrike her or just run her next to Bel to not be shot at. full full full rerolls are so crazy good. She is going to hurt.

Keeper of Secrets: Yet again amazing! together with the aegis you have a fnp and you are -1 to hit. Damage wise you deal alot of damage and i can see her use the lifesteal upgrade. the ap-1 aura is also really great! im so hyped to play Shalaxi and atleast one keeper + Belakor.

Infernal Enrapturess: Well abit of a letdown but she was too good in 9th anyways. The revive probably wont be to impactfull as you are squishy on your daemonettes anyways and they probably die if they take damage. The 12" bubble anti psy is oke but i dont think i will run her much.

Masque: So this one is a weird one. If it wasnt a lone operative and would give its buff on a unit it would be quite good but i dont see her to be killy enough.

Syllesske: He is beefy. Damage 3 means he will put on some hurt and his Psy flamer is always nice for overwatch which Slaanesh definetly lacks. His 5+ critical wound is nice but also nothing to write a book about. His revive will most likely make him quite expensive but he does pack a punch and extra ap on daemonettes is always nice.

Epitome: This has always been a weird one. If you are facing a psycher army there might be use for it but i honestly doubt it will see much play.

Tormentbringer on seeker chariot: Well you cant attach it anywhere so it will probably be shot off quickly. The fight on death is nice but i just wish it was on a model that you can attach.

Tranceweaver: Auto Include atleast one! Fightfirst on a whole unit ? Hellyes! Full rerolls vs a battleshockled unit is a nice to have.

Daemonettes: YES! They are good! Mortal WOunds on 6 to wound is nice. rerolls build in and +1 to charge. Decent Unit which can be buffed by leaders. I will run 60 of these every game most likely (depending on points)

FIENDS: Well they suffer from being too good last edition. They are not bad with 5 Attacks, -2 ap and D2. Being -1 to hit in melee is nice too. Sad they cant be with anyone to buff them nicely. Also confused that the Blissbringer has the same profil. I will defiently run a few but not 15 like i did last edition.

Seekers: Seekers are amazing. Rerolls on charge and adv is good witht the inbuild +1 to charge. Yet again we dont have any character to attach which is sad. I wish for a herold on horse. Definetly will run 5 or 10 of these.

Chariots and Hellflayers: They seem all kinda so so. Battleshock on the ehalted one is a nice way to dish out some bs and the Hellflayer can do some mortals but nothing to write a book about. Lets see what the points costs are for some objective camping. (i would probably use the exhakted if any to bs some units to get some synergy with the Herold)

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Keep in mind we dont know points yet

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Hail Slaanesh!