I thought this was kind of silly...and then my Norse Siege units got a hold of it, when I was deliberately trying to flip a Greek town.
>D
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Level 1 Ballista deals 138,240 damage to buildings in one hit. And I have stronger than Level 1 available. I was shocked to see a number that looked greater than 400,000 in one hit.
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Level 1 Arsonist deals 53,240 damage to buildings in one hit. Unopposed, it could level a town in roughly 3 turns.
Man, I love this game!