NGYR
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This isn't a bug, but rather a safeguard against a disrupted sequence. Since you've already eliminated the threat to the kingdom, the quests in the general headquarters no longer make sense, as their ultimate goal is to repel an enemy you've already defeated. However, you can still finish the game; all extra content is simply inaccessible from now on.
Well, they could have at least added a message indicating this. As it is, the town hall simply remains silent, providing no message, and you don't understand what the problem is.
