Ley
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Typically, you can hire 2, resulting in a total of 30 imps. That means 3 additional demons overall.
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Does this significantly impact the tactics?
Why 2? I disagree. Consider that you might find a couple more castles like this... each of them could also have 2 (it's just that you're saying it, but it doesn't happen that rarely, and sometimes there are even more), nevertheless, this possibility only exists for this castle.
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."