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By the time the enemy has 10,000 skeletons, a skilled player will have something to counter them with. For example, the Elf has around 300 archers and 150 druids, the Knight has 1500 crossbowmen and 100 paladins, the Warlock has shock potions dealing 3000 damage, the Wizard has 70 Rakshasas and 40 Titans, plus powerful spells. Only Inferno cannot effectively counter them.