Mushroom Rock Road
The Mushroom Rock Road is a pathway that you can take from the Djose Highroad / Miāihen Highroad area.
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The area is involved in a large battle when the story takes Yuna and the team to the precipice of Mushroom Rock. Refer to the strategy guide and walkthrough section for additional details:
12) Mushroom Rock Road
Walkthrough Guide
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Traveling through the valley and participating in the first battle against Sin with the Al Bhed and their Machina.
You may run into a Dark Aeon here if you have obtained the Magus Sisters. The Dark Aeons are the Dark Magus Sisters.