Inquisitor Leet said:
Its true that he will always get his save but with AP2 weapons he will get a 5 inv save as opposed to his regular save
The only daemons with a regular save aside from it's invunerable ones are the Bloodthirster and Bloodletters, neither of whom are allowed in a Slaanesh army since they are Khornate daemons.
Now, I'm a World Eaters player myself and my World Eaters list sounds quite similar to this one, though you'd need to chance the Keeper of Secrets for a Bloodthirster, drop the Mounted Daemonettes for two Khornate Dreadnoughts and the regular Daemonettes for Bloodletters. Add in a few Khorne-marked Chaos Space Marine Bikes to that and you've got my list. :>
Now, the deal with these 'daemon-bomb' lists is to hit them hard before they get their numbers in, sounds simple but it ain't. Unlike my army however, this one has an advantage, Daemonettes are about half the price of a Bloodletter, so it's got numbers and with numbers you can field more squads and with more squads you're more likely to succeed with more summoning rolls. It's not as simple just to gun down the summoning champions, since turboboost makes their save invunerable, but they'll probably be making good use of any terrain there is to shield them from your guns.
What to do against this then? Once the daemons have been summoned they're the priority target, especially the Mounted Daemonettes, if they're summoned from a turboboosted bike they can easily be in close combat on turn 2 and what's worse is that they've got Rending attacks, so not even a Leman Russ is safe from them. They're like extra fast Genestealers which makes them quite nasty, however they don't last long if shot at... which is the tricky part.
Now, his army will be low number for the first few rounds and the few units he'll have will probably be hiding behind terrain when deployed incase you get the first round... which leaves us with plenty of space to work with. A basilisk could cause some serious damage if you're lucky, but scatter ain't that reliable so I wouldn't count on it. Any good with the scatterdie?
Against the Keeper and the Daemon Prince there's only lascannons and plasmaguns that have any real effect on them, because massed fire will be far more effective against the Daemonettes - against lasguns they're just as resiliant as guardsmen.
An army that uses terrain to their advantage this much is a good spot for the otherwise useless mortar, with a Daemonettes thoughness and save it's not that bad accually. Especially since Daemonettes can be pinned.(I wasn't sure about this at first, so I asked in the chatroom and Rork said they could so don't blame me if I'm wrong.
) In short, pinned daemonettes die.
Vehicle mounted flamers would also be neat, but don't put it on an expensive Russ - Use hellhounds, chimerae and sentinels. When a Daemonette is attacking a vehicle it's only the rending attacks that matter anyways, so against non-rending attacks a Sentinel is just as impregnable as a Russ. Especially Sentinels will be good here, since if they're assaulted as many Daemonettes as possible will have to get into base contact with it and because it's open topped, the chance is high that it'll and take quite a few of them with him. Sad part is that because a Sentinel has a WS value they'll be able to consilidate afterwards, so using a Chimera for this might be just as good.
If you do use a Chimera as bait for the 'nettes, depending on how good shot you can get with them any flamer(remember that you can open the hatch and fire - you're only open topped against enemy
shooting so there's no real penalty) Also remember the chimera lasguns, daemonettes die when shot, so they might even score a kill or two.
If you don't think you'll kill a good bunch of them with the chimerae's shooting, then make sure you move 12". If they try and assault your tank, they'll only hit on 6's which will reduce the chance of any attacks being rending.
Remember to use your Chimerae in teams, so that when the Daemonettes destroy the first one you've got another mobile fireplatform that can move forward and fire at the daemonettes packed toghether along the wreckage of the last Chimerae.
I wouldn't recommend using battlecannons againt the 'nettes, the heavy bolters will probably score more kills in this case. 4+, 2+ and a 4- to kill them.
That's all I can think of for now. Grey Knights might be good against the bikes, but the Daemonettes will tear them appart with their rending so they might not take their points back. Besides, Guard armies are much cooler without any allies. :>