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If you have captured a Hero as a result of a battle they will appear in the Feasting Hall with Loyalty level 0. This will only happen if your Feasting Hall level is higher than your current Hero total.You can Persuade captured Heroes to join you with Medals or Release them if they have low stats. Anything more than 60% on at least one stat is a reasonable criterion, provided they are low level. High level Heroes with low stats should be Released.