The Maku Tree will tell you that Queen Ambi left her palace, so now is the time to save Nayru.
Quest items:
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Optional items:
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Dungeon items:
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Before the next quest
Now that you have the Mermaid Suit, you can explore the sea bottom around Crescent Island.
During Ambi's age there is a cave in the south-west. Go down to the end and dive in to bypass the blockade and surface on the other side and enter the cave. Talk to the Tokay to receive the L-2 
Iron Shield (in a linked game, if you owned the Iron Shield already, you will get the L-3 
Mirror Shield instead).
During Zelda's age, there is a passage under the north coast of Crescent Island. This is a small maze, so most of the passages are dead-ends. Swim following one wall (e.g. clockwise keeping to the "external" side), and you will eventually reach a cave. Open the chest inside to receive the last 
Piece of Heart (last one except if you still have to get one from Gasha trees or Maple).
Ambi's palace and Zora seas
Ambi's Palace
Return to Ambi's age and go to Ambi's Palace. You will meet Ralph again at the palace entrance, and he tells you of a secret path to the palace, since the front door is packed with guards. You need to push four buttons in each corner of the palace garden, but you should hide from the line of sight of the Palace Guards, otherwise they will throw you out of the palace and you have to sneak in again. Once all four buttons are pressed, go east where the four statues moved away to reveal the stairs behind the bush. Go down and dive in the small pond there. Swim through the underwater passage, emerge at the end and go upstairs.
You are now inside the palace. The Guards here won't throw you out, but instead attack you. Move one block away and go west first. After two rooms you can get the 
Gold Luck Ring. Go all the way east; if you need healing, then go north to find two Faeries, otherwise just climb upstairs and go through a few rooms. You will meet Veran in the last one.
Boss: Veran
This boss needs some preparation. First, equip yourself with Switch Hook and Seed Shooter with Mystery Seeds. Veran is inside Nayru's body, so you cannot attack her directly. You need to shoot her with Mystery Seeds from the Seed Shooter.
Veran will warp around and throw fireballs in all direction. Once you shoot her, then Veran will leave Nayru's body, but you need to drag her away from Nayru, so use Switch Hook on her spirit to move her away from Nayru. After that she will finally take her true form and you can attack her with the sword. Hit her once and she will return into Nayru's Body, so you need to repeat the steps twice to defeat her.
Zora Seas
Nayru will return to her sense and Queen Ambi will come in and Veran will take over her body and call the Guards to capture Nayru and you. Ralph comes in and Nayru will send Ralph, you and herself to Zelda's age. Nayru will teach you the 
Tune of Ages with which you can travel forth and back in time. The Maku Tree will tell that one Essence of Time is inside a Fish. Climb up the Maku Tree to the roof and you'll find 2 
Gasha Seeds there.
Do you have a Magic Potion in your inventory? If not, then you can buy one at Syrup's Shop for 300 Rupees, swipe one from Maple or get it from a Gasha tree. Now go to the South Shore and swim in the water. Go down, left twice, down twice, then left. Go onshore and play the Tune of Ages. Swim left twice and go up and play the Tune of Ages. Dive in and go right. Use the Switch Hook on the Diamond and surface. Play the Tune of Ages on the Isle. Go left twice, down and play the Tune of Ages just by the stairs or you'll be teleported back. Now dive and go down and use the Switch Hook on the Diamond. Go left and you're in Zora Village.
Go up, left and surface and dive in again on the other side to get a Gasha Seed. Go right and surface. Get Gale Seeds from the Tree and play the Tune of Ages. Dive in and go up twice to enter the Zora Palace. Go upstairs and give the Magic Potion to King Zora. Now return to Zelda's age, since you gave him the Magic Potion, he will live for 400 more years, until Zelda's age. Go up twice from the Gale Tree and get 
Green Holy Ring from the chest.
Enter the Zora Palace again and get 200 
Rupees from the chest and go upstairs. Ask King Zora for the permission to enter Jabu-Jabu which he deny, but if you save Jabu-Jabu from the polluted seawater, then you'll receive the permission. Agree to it and he give you 
Library Key. Leave the Palace and go right twice. Resurface and play the Tune of Ages and use the Switch Hook to go to a cave. Inside is a Red Octorok which got transformed from Great Fairy and need your help to find Fairy Powder to break the curse placed on her by Veran. Go right twice to find the Eyeglass Island Library. Use the Library Key to open the Door. Now travel to Zelda's age and enter the Library. Get the 
Book of Seals from the old man in the back room. Now back in Ambi's age and reenter the back room in the Library. Place the Book of Seals on the pedestal. It give you direction to how to walk in the darkness.
- Book: Right 4x, Up 2x, Right 2x
- Book: Up 2x, Left 1x, Up 2x, Right 1x, Up 1x
- Book: Left 2x, Up 1x, Left 3x
- Book: Down 1x, Left 3x, Up 1x, Left 3x
- Book: Down 1x, Right 1x, Down 2x, Left 2x, Down 3x
- Book: Right 1x, Down 1x, Right 2x, Up 1x, Right 1x, Up 1x, Right 2x
You have reached the Old Man by following the directions of the six books. As reward for your courage the Old Man will give you the File:Zelda Oracles Fairy Powder.png Fairy Powder. Now return to the cursed Great Fairy and use the Fairy Powder on her to break her Curse. She in turn will clean the Sea of the Poison Bubble. From Zora Village Entrance swim right three times and play Tune of Ages on the small Isle. Dive in to the right and resurface to find 
Whimsical Ring from the chest. Return to King Zora and receive his permission to enter Jabu-Jabu's Belly. Leave the Palace, go down, left, up twice and Jabu-Jabu will open his mouth, so you can enter.
Jabu-Jabu's Belly
Dungeon, part 1
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Miniboss: ?
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Dungeon, part 2
Boss: ?
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Obtain the 
Heart Container and proceed north to get the 
Sacred Soil.
- "?."