When playing Single Adventure, I always take a mass spell of Light from Attack or Defense, more often from Attack, because it combines with readiness. After the curse on the Sorceress, the Necromancer casts mass haste, and the curse disappears. And calmly, BEFORE the next round, Subjugate is cast on the Goblins, and even more so on the leaders, if they can attack the Goblins. It is very difficult to coordinate the attacks of the hero and the leaders with the constant resetting of the mark with mass haste.
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Blindness and Sleep. Even in battle, the Princes have a 60-70% chance to put the enemy to sleep. No one ever hopes to Subjugate Cyclops.
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So, you were not attentive. Load the duel, arm yourself with a calculator, and check.
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The Magistrate in every city pays for itself, almost like buying levels 1-5. And the Necromancer has nowhere else to spend the money.