Use the Gold Libra to return to the Styx. On the banks of the river, soak the parchment in the water until you can see the words clearly.
Be careful! The water that flows in the Styx is poisonous to the living!

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Introduction

The Wraith Tome continues to torture Milia, but she was happy to see that Garlandi guessed her wishes correctly. After handing you another parchment, she told you the words will only appear when soaked in the River Styx!

NPC Dialog

Garlandi has done well! As much pain as I am in, I
m still glad to see he understands what must be
done. Take this parchment and soak it in the River
Styx. It may take some time, but believe me... the
words will appear. But, watch yourself, for the water
is poisonous! Now, go! Before the Wraith Tome
decides to take you, too!