Magical damage of spellcaster creatures.

I searched the forums and manuals for a long time, trying to find out how the damage from magical attacks of Warlocks is calculated, but I couldn't find it, so please don't be mad if this has already been discussed. The damage dealt by the magic of creatures is calculated based on their spell power, which, in turn, is calculated based on the number of creatures in the stack. But do the hero's skills affect this? The hero's spell power, or, for example, the maximum level of magic in one of the schools? In other words, will the power of the Fireball attack of Cave Lords increase if the hero has maxed out the Chaos magic skill?