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The sand of One-Iron Beach is of a high percentage content of iron ore. This makes the sand look completely black at a distance.
You've caught them. Now what?
This is a perfect place for revenge.
You're trust is broken. You will not punish them but they can no longer continue in your party.
Everyone messses up. Let's continue on together and forget the past.
Let them go. You just want to forget this all happened.