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Just found something ... you said if they HP HIGH ...
It seems MC Stamina and HP effect them too, so if MC force slave to fight with them, but MC stamina / HP low or empty, it seems they can't get "Courage" too ...
Also I notice, if one of your slave get very low HP (in red icon), the other will get affected too (can't get courage) ...
is Courage system is really that hard ?
somehow my bug above get fixed after one of slave back from training, weird ...