Zybr
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Don't forget about Blindness and Teleport.
Also, don't forget that the amount of mana is limited, and phantoms give 880 health for 40 levels (requiring 5 mana, which is less than 4 unequipped behemoths, and to defeat a hundred or so remaining enemies, you'll have to create many of them. This is about how much mana the spellcaster has, the slightest mistake or miscalculation, and it's over. It's unlikely that this fits the definition of "easy." Easy is when you can do a hundred pull-ups on a bar, and you're asked to do 10, but not all 100-110 as it is now)
Maybe the mage will win, but I don't agree with "easy." In my opinion, it's not easy at all, but rather quite difficult, at least considering the high risk of dying.
There can be many more illusions, up to +40% (without artifacts). You can get -50% to the cost of spells, and so on. Saving mana and strengthening your own spells is not a problem if you set that goal.
In a way, this goal itself is somewhat silly, because the initial approach is not very rational. But on the other hand, it's useful to be able to use spells like hypnosis to break through neutral creatures.
But I repeat once again that such a battle is very easy to carry out.
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!