Ocean realm

"Fourteen-year-old cousins Gwen and Vic are still celebrating their victory in the battle with the merlons and their giant kraken when they learn that Vic's father has finally made it through the crystal doors to the magical island of Elantya. However, their victory is short-lived when they and their friends are kidnapped by their underwater enemies and taken beneath the sea."
"Two cousins are transported to the island of Elantya, where they are caught in a tempest of ancient magic, vicious creatures, and fierce battles, all connected to a territorial feud with the sea-dwelling merlons."
"Two cousins are transported to the island of Elantya, where they are caught in a tempest of ancient magic, vicious creatures, and fierce battles, all connected to a territorial feud with the sea-dwelling merlons."@en