Posts from Gameplay tactics on the large map. Auto-translated

There shouldn't be any problems with this either. Place the Furies in a corner, with Stalkers next to them, and a line of Minotaurs or Stalkers in front, depending on the opponent's initiative. The hero will fire a couple of times, and the Furies and Stalkers will take down the approaching stacks. You can deal with the retaliation with the same units.

Or, in a worst-case scenario, you can deploy only Minotaurs. While the hero is firing, they can withstand a few hits, and in the final stage, they are almost useless anyway.

But again, if you're aiming for Hydras, you might not be able to get to the Minotaurs as quickly as you'd like, and by that time, there will only be a few of them left.

Exactly, and when the skills are also bad, it's even worse. By the way, does Frost Nova one-shot catapults?

Yes, with this talent, any unit with a cold-based attack will be one-shotted.

Yes, with this talent, any unit with a cold spell will be very effective.

Cool, thanks. I haven't had a chance to try this skill in action yet, but now I know that it will make it difficult for me to be besieged.

Yes, with this talent, any unit with a cold spell will be very effective.

Yesterday, I played with a friend in a strategy game; he played as Deleb, and I played as Nur. Right from the start, he got the "Secret Defensive Cloak" (an item that provides resistance to water and ice) - as a result, the "Deadly Cold" spell dealt 1005 damage (to the ballista's health) instead of 1100. This was one of the factors that led to our defeat.

So, fellow Warlocks, keep in mind that items that provide resistance to ice don't prevent a unit from being destroyed by a spell (maybe this is common knowledge, but it was a revelation for me, and it might be useful to someone).

Yesterday, I was playing with a friend in a strategy game; he was playing as Deleb, and I was playing as Nur. Right from the start, he got the "Secret Defensive Cloak" artifact (an item that provides resistance to water and ice) – as a result, "Deadly Cold" dealt 1005 damage (to the ballista's health) instead of 1100. This was one of the factors that led to our defeat in the final battle.

So, fellow warlocks, keep this in mind: artifacts that provide resistance to ice don't allow you to destroy a machine in one cast (maybe this is common knowledge, but it was a revelation for me, and it might be useful to someone).

I tested this in duel mode, and it's indeed a bit strange. I tried using this perk against heroes with "Secret Defensive Cloaks" (25% resistance to ice) and "Flame Tongue" (50% resistance to ice). With the "Whip of Cold," it didn't destroy either the machine or the level 7 creatures. With the cloak, the results were inconsistent. Sometimes it destroyed level 7 units, even though it shouldn't have based on the amount of damage, but it didn't destroy machines. In another case, it was completely unclear. "Deadly Cold" destroyed the ballista but left the tent with a few hit points, even though it shouldn't have destroyed anything based on the normal damage.
I think this is how it works. In general, the perk itself deals additional damage in the form of + the health of one creature, but artifacts reduce the total damage. If the damage reduction doesn't negate the excess damage, the perk destroys one creature or machine, but if it does, it doesn't destroy anything, but it still deals more damage.
For example, a ballista has 1100 health with expert machines, and let's say "Ice Bolt" deals 500 damage. With the perk, it adds another 1100, resulting in 1600 damage. The enemy has a cloak that reduces ice damage by 25%. As a result, instead of 1600, it will deal 1200 damage. This is enough to destroy the ballista. But if the damage from "Ice Bolt" is 200, with the perk, it will be 1300 damage, but with the damage reduction from the cloak, it will be 975 damage. As a result, it's not enough to destroy the ballista, and it will survive with 125 health. That's the story.

Judging by your post, "Deadly Cold" should have dealt 1340 damage (240 + 1100 from the perk), but with the -25% reduction, it dealt 1005 damage, and that's why the ballista survived.

But it's clear that the Shadow League has less chance of ending up in this situation, as they penetrate magic defense, even if only partially.

And isn't the number of "targeted" units a factor? Like, if you repeatedly attack with a ballista and titans, one of the units will definitely lose a creature, but the other might not, unless you only use the ballista, in which case it might not kill anything... Although the explanation above seems more plausible.
Overall, it's a rather interesting mechanic.

Deadly Cold deals additional damage to EACH stack, equal to the hit points of one unit. This additional damage is affected by magic resistance (Protection). This has been known for a long time.