Sirenix is the second transformation of Season 5. It is water related and the Winx looked for this ancient power to fight the villain Tritannus as their Believix powers were too weak underwater. Guardian Fairy of Technology Tecna, helps the Winx on the quest to find the Book of Sirenix but turns into a dark Robotic version of herself as a result of a spell put on her phone, while trying to find to book of Sirenix by the Trix.