Musa Sirenix Style : 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. Musa along with the other Winx, start their quest to earn the power of Sirenix. To help them on their quest through the oceans, they earn Sirenix Boxes which give the Winx the power of Harmonix. Exclusive Games