(Refer to Endless Ocean: Blue World.)
The Okeanides were believed to have been a mysterious ancient ocean-faring civilization that created the Okeanos Tablets, and are also believed to be the origin of the legends of the Song of Dragons.
Tablets left behind by the Okeanides have been found around the world and are considered out-of-place artifacts, never fitting the time or location they were found in.
Okeanos Tablet: Valka Castle
In the game, your character finds an Okeanos Tablet in the King's Chamber at Valka Castle. It is a lapis lazuli slate with the language of the Okeanides engraved on it. Luckily, you find out that Hayako Sakurai, a professor in Japan, has been studying the language of the Okeanides and deciphered the tablet for you. It reads:
"The treasure of Pacifica sleeps with the queen behind the bronze door in the abyss. The fissure filled by the circular ocean shows the way to the queen's tomb. Offer your flute to the sun of morning, noon, and night, and the dragon's song will open the gates to treasure."
According to Hayako, the term "dragon's song" appears in many of the Okeanos Tablets. With the mention of the Pacifica Treasure, you and Oceana want to persue the truth behind it.
Okeanos Tablet: Cortica River
You find another tablet in the Cortica River's Twilight Temple, another structure thought to be left behind by the Okeanides. When you head back to the boat, Hayako reads the tablet, explaining that the entire rise and fall of the Okeanides was chronicled on the slate. She says:
"According to this, they were a people who spoke to and controlled dragons. To do this, they used something they refer to as the dragon flute. The Dragon Flute was made of lapis lazuli, and it could be used to awaken the dragons and give them orders. However, the Dragon Flute was ultimately dismantled and thrown into the deepest depths of the sea in order to protect the royal treasure, which is guarded by the dragons. It says the Dragon Flute was divided into three pieces. And when they are all assembled, the dragons can be awoken!"
-Okeanides is derived from the Greek word "okeanos," (ωκεανός) which translates to "ocean" in English.
-In the contents of the tablet from Valka Castle, the term "circular ocean" refers to Anaximander's Map of the world, where Anaximander believed the earth to be a cylinder. He thought on both circular sides was land surrounded by water, and across from each other was okeanos, or the ocean.