In the past during Queen Ambi's age, King Zora had fallen with an illness due to the polluted water coming from the east. His sickness could only be cured with a Magic Potion, however the Zoras were unable to find one, and the King Zora would later pass away. As the King Zora did not leave a successor to the throne, the Zoras would be left without a king in the present time. A Zora in the present says that their last king, the King Zora, had died centuries ago. Link can give the Zora King in the past a Magic Potion to cure his illness. Once cured, the King Zora in the present will grant Link the Library Key in order to research the causes on why the water of the Zora Seas has been so polluted lately. The young hero, with the help of the Fairy Queen, is able rid the sea of its pollution in the past, which grants Link permission to enter inside Lord Jabu-Jabu during the present time and receive another Essences of Time in the process.
As Link exits the insides of Jabu-Jabu, a Zora crosses his path and thanks Link for all he has done for the Zora people, granting the young hero a Zora Scale for his help.
↑"We believe we need a special medicine called a Magic Potion to cure King Zora's illness." — King Zora (Oracle of Ages)
↑"King Zora has no successor. If his illness continues and he passes on, we Zoras will lose our last king." — Zora (Oracle of Ages)
↑"This is the key to Eyeglass Isle Library east of here. It is an ancient library, so I do not know if this key still works, but perhaps you can research why the seawater is so filthy. I trust you to save Jabu-Jabu." — King Zora (Oracle of Ages)
↑"You have done so much for us! Our seas are clean and all is well! I offer you our symbol of heroism--the Zora Scale!" — Zora (Oracle of Ages)
↑"Say, aren't you a pupil of the master diver in Holodrum's Sunken City? I have a secret I'd like you to tell to your master." — Human (Oracle of Ages)