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I'm talking about their ability! This isn't magic (i.e., it's not an explosion spell => it doesn't depend on the base growth)!
http://www.heroesofmightandmagic.com/heroes5/inferno_creatures.shtml
If you hover your cursor over the "explosion" ability, you will see its description.
Ideally, the explosion power is equal to 9 + 9* the number of demons in the stack, but by analogy with other units, this formula most likely applies to small numbers. That is, if there are 100 horned ones in the stack, the damage will not be 9 + 9*100=909, but much less; I can check the explosion damage for 10, 30, 50 and 100 demons in the editor :) if you're interested:)
Белый и Пушистый! Иногда.....