DirtyLiar
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Using the same logic, one could argue that a single caster unit is overpowered. It's "not quite right" when 1 monk casts a buff on 10 angels.
Although I don't like it either, I would tie the effect of the buffs to SP.
But this is not a triggered ability.
Or when 1 paladin removes mind control.
Or when 1 peasant removes retaliation or blocks the path for a group of knights. And so on.
But again, this is not a triggered ability.
There are things that play a role in certain situations, regardless of the amount of units, and this is a perfectly normal phenomenon, in my opinion. The fact that they are supposedly imbalanced has not been proven by anyone yet. Some people simply like this state of affairs, while others don't.
But at this specific moment, I'm talking about triggered abilities. Which, for all units, trigger depending on the ratio of the attacker's and the defender's parameters.
But for the Necromancer, it doesn't. It's a chance not tied to anything.
As far as I remember, the Necromancer's speed is not 8, and corpses don't trigger retaliation, so the chances of actually hitting anyone in the aforementioned scenario are quite slim.
If we're talking about breaking through, then it won't be possible to break through for long in this way, unless with cheat loads. And the effect of halving is also questionable in this case, because if there are few Necromancers, they won't be enough to finish off even the halved stacks. Especially since when attacking достаточно strong neutrals, there will be many stacks.
I'm talking more about the trickster.
In short, the overpoweredness of this ability, in my opinion, is a myth.