My favored tactic is to feed it cheap summoned units until I'm ready to take it on. Surrounding one with plague bearers, daemonettes, plague drones, anything at all to prevent it from charging, is preferable in most cases to
I'll wear it down a little through chaff units and psychic powers, and then chard with Screamers and/or Be'lakor to finish the job.
A complete list of the ways daemons have to kill Knights:
Be'Lakor
D-Thirster
Skarbrand
Lord of Change / Daemon Prince of Tzeentch with Staff of Change (S8 attacks)
Daemon Princes of Slaanesh (Rending)
Greater Daemons, Daemon Princes or Heralds with any of the following
- Greater Etherblade (S7)
- Touch of Uncreation
- Biomancy for Iron Arm
- A number of witchfires or blessings to help\
- A few of the other Daemonic Rewards;
Plaguebearers
Plague Drones
Soul Grinders in combat or with Warp Gaze
Burning Chariots
Screamers
Being realistic: Be'lakor is by far the most reliable option there. He always gets S7 Armourbane, is Eternal Warrior, has a 2+ cover save and 4+ invulnerable.
Screamers can reliably get work done in combat if they manage to attack first, but they'll need 3 rounds to get it done if solo, which the Knight can probably kill you in. Plaguebearers, Plague Drones and Soul Grinders bring up the rear outside of the Daemon Princes.
The various ranged options we have (Burning Chariots, Skull Cannons, Soul Grinders)... barely worth trying. If they are LUCKY they'll do one hull point over the course of the entire game; with needing to roll 4+ to hit and the Knight getting a 4+ invulnerable, and the super low volume of fire power availabe this way (3 shots from one CAD?) you're not going to get much done here.
The various options with Daemon Princes and Heralds require a lot of random rolls for Gifts and Psychic Powers going your way. Perhaps if you're running 3 Nurgle Princes you'll get enough rolls for one set to come up right. Skarbrand could probably happily one-round a Knight, so long as you could catch one before you die. The D-Thirster is at severe risk of being D-Weaponed or Stomped off the table before striking due to his I1 weapon.
So essentially, you have 2 reliable options to kill a Knight (Be'Lakor and Screamers), a host of unreliable ones (Gifts and Psychic Powers), and a few so-so ones (Skarband, D-Thirster) who would be great if only they could make it to combat.
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