The Secret Treasure Under the Great Fish is a side quest that you can do after reaching the beautiful region of Lanayru Great Spring in Zelda: Tears of the Kingdom.
Sidon, a prince of Zora and the son of King Dorephan, asks for your help deciphering some ancient texts that may lead to a secret treasure. You will be given some clues to track down and, with our help, uncover the Secret Treasure Under the Great Fish in Zelda: TotK.
Talk to Sidon in the Throne Room
Note that you can only unlock this side quest after completing Sidon of the Zora, a rather lengthy main-story quest involving conquering the Water Temple and defeating Muctorok.
Once that is done, go to Zora’s Domain and enter the Throne Room to speak with Sidon. Speak with him at coordinates (3337, 0539, 0164) to start the Secret Treasure Under the Great Fish quest in Zelda: Tears of the Kingdom.
Find the Cave Beneath Zora’s Domain
There is actually no “great fish” in the game to find. That is a clue for a massive fish statue you might have spotted while exploring Zora’s Domain.
To begin your search for the Secret Treasure Under the Great Fish, you need to make your way to the Great Zora Bridge.
The said bridge is on the opposite side of the throne room. Return to the bridge and continue until you see a waterfall to your right.
Jump from the bridge and glide to reach the waterfall. Swim to the back of the waterfall to find the Cave beneath Zora’s Domain. This cave is also home to Zora’s Domain Chasm.
From the cave’s entrance, go straight until you see another waterfall. Glide to reach the waterfall and go behind it. You will find a treasure chest placed on a small platform here.
Quest Reward
Open the treasure chest to obtain Vah Ruta Divine Helm. This helm was once worn by a legendary sage during the time of Rauru, and now it belongs to you.
This will complete the Secret Treasure Under the Great Fish side quest in Zelda: Tears of the Kingdom.
