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What’s a cultist bomb army list look like and how do you beat it? I’ve heard people talk about it but I don’t know what it is.

Not sure. Swarms of them daisy chained back to a hidden Iron Warriors lord who makes them immune to morale and then like 10 Malefic Lords and shooty stuff?

I don’t know except that it is one of those soup armies.

Abaddon or a cheaper IW lord with their WL trait is a good start.

Then of course there is Alpha Legion blobs infiltrating.

Another absolutely hilarious thing that can be slapped on a cultist blob is a Tzeetch Psyker giving them a 5++, and 4+ BS.

Or an iron warriors sorcerer of tzeentch giving them all of the above. 5++, fearless and generally bad to the bone.

Just throw in the Veterans of the Long War stratagem and they suddenly become a serious threat, at least for their point cost.

maybe better a Slaanesh sorcerer for FNP so they save anything also mortal wounds.

Who is flinging mortal wounds at cultist blobs?

well can happen ,so you can save, some aura abilities for example deals mortal wounds.

What is the best way to counter the cultist bomb?

From what I understand, a Cultist Bomb is when you take 30+ MoK CC Cultists, use Tide of Traitors to move them up the board, use Warptime to get them in place for an assault, then use Fury of Khorne to attack twice. The 'bomb' is when you use Tide of Traitors a second time to repeat the process.

Incredibly annoying. When done right, it can shut down an entire flank of your opponent's army. Obviously, they need support from a deep striking Sorcerer, who can also do things like Death Hex to screw with an opponent. I use Abaddon to give them all rerolls to hit, which makes them a little lethal.

So I’m thinking you need to carefully deploy so they only hit your bubble wrap and can’t consolidate into fresh unit. Also flamers will mess them up.