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That's exactly the point, I used an exaggerated value in my example. Now imagine how many monsters the enemy will have by the time you level up to 50? Accordingly, a less developed hero will face smaller armies—but proportionally, the situation remains the same.
Regarding being "leveled up," that's not entirely true, because other skills are leveled up as well, at least combat; and go ahead, blast everyone with Armageddon for all they're worth—it doesn't affect Efreet or own Demons, but it deals 1000 HP damage)
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A fully leveled hero is strong with any magic:)

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!