Winx Club, Season 5

Sirenix Book:
The quest for Sirenix begins. But know this, there is a curse upon Sirenix. You must complete the quest within one lunar cycle, or you will all lose your powers forever.

Stella:
Yeah, yeah, yeah!

Bloom:
We know. And we are ready to begin.

Sirenix Book:
To gain Sirenix, you must find the Gems of Self-Confidence, Empathy, and Courage, which are hidden in the oceans of the Magic Dimension.

Aisha:
That will be challenging. Unfortunately, our Believix powers don't really work underwater.

Sirenix Book:
For each of you, a Sirenix box. Your Guardian of Sirenix resides within. You may call on her for help during your quest.

(The Winx glow)

Musa:
What's happening?

Sirenix Book:
Your Guardians have granted you a new fairy power: Harmonix. It will allow you to swim faster and use your powers freely in the ocean. The quest begins.