Secret of the Ruby Reef

Tritannus raids King Neptune's underwater palace and transforms his entire family into mutants. Then he absorbs the power of his dad's mystical sword. Meanwhile, Musa, Aisha, and Stella get a second clue to Sirenix which leads them to Musa's home world, Melody. Searching for the Gem of Empathy, Tritannus transforms Musa into a monster and she is saved when she bonds with the Selkie who guards Melody's ocean gate, Sonna. Meanwhile, the Trix and Tritannus reach Daphne in Lake Roccaluce, and capture her.