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Why +10?
Let's calculate:
The Castle provides +2 Cyclops per week.
By capturing all five dwellings, we add another +5 to the city's production.
We also collect 5 Cyclops from each dwelling once a week, which is another +5.
And by digging up the Tear of Ashera, we add another +3 per week.
In total, the maximum number of Cyclops that the Orcs can produce in a week is 2 + 5 + 5 + 3 = 15.