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With the undead running amok, you want to keep as much distance between yourself as possible. Roll out the fully upgradable ballistas, catapults, and cannons to break through the skeletons' defenses until all of the necromancers have been dismantled. Upgrade to ensure that not even the black arts will prevent their bones from shattering and their skulls from splitting.
Use your mouse to click and drag from your catapult toward the defenses.