Dark Sirens

The Dark Sirens are a group of evil mermaids who kidnap Andros' queen every time the Mermaid's Tail constellation shines brightest in the sky. Mysteriously tied to the constellation, the Dark Sirens seek to bring their group up to five, one siren for each star in the Mermaid's Tail, as once they are successful, they will become unstoppable.

Members

 * Limes is the leader of the Sirens and the youngest. She has dark blue hair and demonstrates powers over darkness; specifically light absorption and spreading darkness
 * Terala is the Siren with red hair who is seen shooting poisonous quills from her palms.
 * Unla is the Siren with orange hair who is seen shooting bits of coral from her palms.
 * Nazca is the Siren with seafoam-colored hair who is seen shooting blasts of darkness.
 * Asfodelia is the fifth and final Siren needed to complete the group. Niobe was set to become Asfodelia if her conversion went uninterrupted.

History
According to King Teredor, the Dark Sirens were once beautiful queens who faithfully served Andros in ancient times before they were forcibly turned into creatures of darkness. Approximately one thousand years ago, the last of Andros' queens, Queen Limes, was kidnapped by the Dark Sirens and turned into one.

#107: The Dark Sirens
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Trivia

 * The fifth and final Siren, Asfodelia, is the only one of the Sirens who never makes an appearance. This is because Niobe was supposed to become Asfodelia upon being converted into a Dark Siren, but she was luckily rescued by her daughter, the Winx and Selkies before then.
 * It is unknown who amongst them was the first Dark Siren. The only thing that is stated is that Limes was the last queen to be turned into a Siren.