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I do not find this working as intended with how this negative and permanent trait can be acquired. You can acquire this when your hero is garrisoned and unprovoked then end your turn to be besieged/encircled by the AI and then start your turn having received this negative trait... You should need to have deliberately passed on attacking your besieger through your turn if this is to be an acquirable trait or it should then be able to be removed through battle if that silly chance of unavoidable acquisition is possible.