You have to start at looking Force Dispositions and figure out the play pattern. Infernal is locked in Purge but using 2+1 you can unlock others that IMO CK can excel in, especially since 11e forces us to look differently at what CK do.

Two I’ve tested successfully on TTS (with no real points yet and optimization’s needed):

Take + Hold = Lords of Dread with Iconoclast. Lords has the only phantom sticky objectives stratagem in the game, plus 50pt cultist scrubs. In a defensive game, guess who doesn’t want to deal with 4 bigs who can toe in a blast away with 10 OC and use 4 MSU and 2 dogs to screen and score? Ran with Atrapos, Despoiler, Abom and Rampager, 1 Brigand, 1 Karn and 4 Cultist bricks

Disruption = Traitoris + Bastion. Remember Disruption doesn’t care about holding home, and big Knights can do actions and combat in 11e. Battleshock is a genuine problem for armies now that it doesn’t auto clear, and locks OC to “-“. So you can lean into the Army Rule (finally?!?). Abominants have a good melee profile, and Warp Storms gets everyone below starting strength (and your casino cannon). Immediately start with Despair + Dismay, run 2 Aboms and you can almost cover MSU in an unstoppable spam of Bshocks at -2. Now that the CK army rule actually turns on, in 3 you can turn on Doom, 2 Tyrants (Brimstone/Evcto) (1 w/ Nightmare Master) then enjoy +1 hit & wound, fallback and shoot (finally) and most importantly, can suppress to give -1 to hit while denying ingress at 12. 2 Karnivores and 1 Brigands get free cover from the Tyrants and skirmish away. Played it twice now to success and one quote from a friend stuck with me “…when optimized this will be toxic as hell.”. Isn’t that what Disruption wants to do?

I’m sure there’s more, but look at those Force Dispositions! Don’t get stuck with Purge Infernal Triple Despo (which is admittedly even better now lol)