Defensive gameplay and other tactics.

If you're writing about the city of Zogsox, the first time I made the Cyclops go berserk, the result was disastrous. The Cyclops first wiped out their own army, and then mine.

After they've wiped out their own army, you should blind them, slow them down, apply a vulnerability debuff, even reducing their defense to 0, and then apply the Necromancer's mark, and then carefully take them down bit by bit with units they can't retaliate against – Vampires and Air Elementals (if you have them), as well as their clones. You can stop being stingy with mana for summoning, resurrection, and blinding, because the Necromancer's mark is worth it.