Fated to Evil

This is a winx club story where Bloom has a younger, goth weird sister who's an outcast and suffers with depression. She's the keeper of the most powerful type of magic, even more than the dragon flame.
Balance Magic of the Majestic Phoenix, sister of the Great Dragon.
The trix are after two powerful powers and would go for every mean to get it but, when they meet the mysterious fairy who possesses one of them they feel ressented in hurting her.
What will happen?