Siverfale
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Come on, Leo just means that the cave can be skipped, and the quest will still be completed. He doesn't mean that it's a bad idea; he even says that it's just as good as any other place for farming S ranks. Although, it's possible that all these extra locations might not even affect the rank.
Where do we go?
Where do we end up when we save the world?
Where do we end up when we save the world?