Pridu
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I don't know if this is a feature in Heroes or not, but it definitely doesn't exist in SoD.
Let's say it's day six.
The situation is: the AI captures a dwelling, you kill that AI – the dwelling turns gray, becoming neutral again. You don't capture this dwelling during that week, but on day 121, you capture it and discover that there are no creatures available for hiring or joining in the dwelling. I tested it for level 1-3 dwellings; I don't know about those that can be repelled.