Name : Meteor Strike
(Uncommon or Rare)
(12 Turns)
Reduce port population by 2% + 0.1%, which the 0.1% can be multiplied by X, which X is every 2 turns invested, at a max of 5X.
Was thinking of having a upgraded version of Black Death.
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Counter,
Name : High Upkeep
(Uncommon or Rare)
(14 Turns)
Increase port population by 2% + 500,000.