Solution

On the middle path, choose the mushrooms and hit the magnet rocks with the golem's attack.

Description

That valley hid astonishing sights. Boulders drifted through the air like clouds, and tiny pebbles crashed to the ground like cannonballs.

Among the many fantastic locales we have seen thus far, the valley has left the most indelible impression. There, magnetized rocks interact with the ambient aether of the environment, causing even the most massive to rise into the air like feathers on a breeze. However, should that delicate balance be interrupted even for a moment, the rocks overhead come crashing down at once. Truly, I have seen naught else like it.

In that most singular place in the valley's depths, we faced an equally singular foe─a lone swordswoman. She struck as soon as we approached her, as if she had been long awaiting a worthy opponent. In the Near East, a bow is a customary greeting, yet if we had followed polite custom, we would have been cut down in an instant.

After our return, my research indicated that long ago in Corvos, practitioners of an ancient sword art known as the Unyielding Blade would hone their skills deep within a similar valley. Anyone who set foot there would be compelled to fight, even if they were no warrior. If one could survive such deadly company for enough days and nights, they would be allowed to leave. Emerging from that place alive was indisputable proof of one's mastery of the blade. The lengths some go to achieve such heights are both impressive and terrifying in equal measure.