Following the path and pick up four items along the way:

• Hades Helm
• Hades Gloves
• Hades Armor
• Hades Sandals

Boss: Octomammoth

The more tentacles you kill the more it deals more damage, so you better watch out for your health.

Once you passed through Waterway, go north and you'll see a castle. This castle has the following treasures:

• Tent
• Power Bow
• Feathered Cap
• Ruby Ring
• Potion
• Antidote
• Eye Drops
• Ether
• Phoenix Down
• Gold Needle
• Iron Arrows
• Holy Arrows
• Elixir

Go inside and proceed to the throne room talk to trigger a cutscene with Anna and Edward. After the cutscene is over, Edward will sponsor a hovercraft for your journey.

Don't go anywhere yet, go back inside the castle to #4, there is a switch leading to a hidden passage across the three rooms with three chests inside.

Go to #5 for more treasures. Once done, get outside and hop on the hovercraft.