Garamsythe Waterway | Part I Final Fantasy XII Guide

Stairs - it's a passage to Lowtown,

* Rare; ** It's better not to sell this

Here save your progress and run upstairs. A trip through sewages awaits you.

In most of the dead ends you'll find treasures...	...well... not only in dead ends.

When you reach the end of the sewages the game will try to assure itself that you really are ready to continue. Go to the stairs [last screen] and pick the option: "Climb the stairs" and next pick the "It's now or never". You'll find yourself inside the palace.