Quest 64/Quest for the Water Jewel

Larapool
After defeating Zelse in the Windward Forest, bring the Wind Jade back to Leila in Larapool, and she'll open the door under the fountain. There, the magic of the water is released, and you can get two more spirits and access the Blue Cave.

Chest items:
 * Silver amulet

Blue Cave
Monsters of the Blue Cave:

Chests in the blue cave:
 * Heroes drink
 * Healing Potion
 * Mint leaves
 * Healing potion

There are six spirits in the Blue Cave.

Crystal Valley
People of the Crystal Valley:
 * Epona
 * Chappy at Epona's Cottage lets you save game

There is one spirit in the Crystal Valley.

Seagoing ship and isle of Skye
Monsters of the isle of Skye:

People of the isle of Skye:
 * Kiliac
 * Boren on the Seagoing Ship lets you save game
 * Macren
 * Colleen

Chest on the isle of Skye:
 * Dragon potion

There is one spirit on the pirate ship and four more on the isle of Skye.

Boss 3: Nepty
The name of Nepty is a reference to Neptune, the Roman god of the sea.