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Sirenix is the eight/fifth transformation throughout the series, and is the second transformation of the 5th season.
Sirenix is an ancient power that is born of the magic of the ocean, and it'll make the Winx swim faster underwater. According to Ms. Faragonda, no one had acquired Sirenix ever since Daphne acquired it, and knows where the Sirenix Book is kept.
When Bloom asked Daphne where the book is, she replied to not to look for it because the Ancestral Witches placed a spell on the transformation and can turn her into a spirit without a body. Daphne reveals that it is kept in the Magic Archieves of Alfea.