Acheron

Acheron is a villain from Season 6 whom Selina used to serve.

Overview
As a dark wizard who learned immensely powerful dark magic on Earth from the terrestrial witches in order to become the greatest sorcerer in the Magical Universe, he created the Legendarium. But he couldn't control it and was trapped inside it. Now, he’s trying to break free with Selina's help. He is currently using Selina to release him in exchange for granting her magical abilities.

Appearance
Acheron has pale skin, glowing yellow eyes, a crooked pointy nose and a black goatee. He has black marks (which might be Kohl) around his eyes with triangular black marks on its edges.

His outfit is similar to the Dark Witch outfits of the Trix, consisting of a thigh-length armor-like tunic with a hood and large hanging sleeves and baggy trousers tucked in boots. It is red with black marks, the part on his shoulders is pale grayish purple and it has a yellow ruby on his chest.

Series
In "The Golden Auditorium", After the Treants failed to take over Linphea College, it is revealed that Selina is in fact working under the orders of a mysterious dark being called Acheron housed inside the Legendarium.
 * -|Season 6=

In the "Attack of the Sphinx", Acheron tells Selina to find Eldora's Diary and destroy it before the winx do because it is the only link to telling how to seal the Legendarium for good.

In "The Fairy Godmother", Eldora tells the Winx the past about Selina and Acheron where she agrees to work under him. Then Acheron gives a bit of power to Selina, dubbing her the Witch of Snakes. Eldora comes in and tells Selina not to read from the Legendarium and warns her of Acheron as the sorcerer who created the book and wound up trapped in its pages. One night, Selina made her decision and pledged her loyalty to Acheron. She stole the Legendarium and fled the Forest of Flowers. Eldora fears that Selina is trying to free Acheron all this time.

Later, Selina had an intention of stealing Bloom's Dragon's Flame because it is the only method to release the book. During the struggle between Bloom and Selina, she tells him that Acheron is his friend and had forgotten Eldora, leading Bloom to defeat Selina without giving despite warn of Acheron.

In the "Mystery of Calavera", Selina contact Acheron because she is annoyed that the Trix won't share their powers. Then, He tells Selina to send the Trix into the Legendarium World to defeat the Winx. In each mission, the Winx finds an item to lock the book, Selina makes mention to Acheron saying that if Winx complete their mission then he could not released.

In the "Legendary Duel", Selina is ready for anything attack Bloom despite being her friend and steal some of her Dragon's Flame so that she can free Acheron.

In "Acheron", Acheron is freed when Selina uses the part of the Dragon's Flame that she stole from Bloom and fights Bloom one-on-one in the Legendarium World. Bloom uses the legend of Alfea against him and successfully traps him in a box given to her by Eldora.

Magical Abilities
As the creator of the Legendarium and a powerful sorcerer, he can invoke any powerful creature to attack its enemy. Even when he was trapped in the Legendarium, he was able to do things like teleport Selina to the Lost Library of Alexandria. When he was free from the Legendarium, he was able to create lightning and bursts of dark magic and also showed to be powerful enough to send the Trix in Legendarium and make Cloud Tower fall. He can also create some dark magic to protect himself (to hold Bloom's Dragon's Flame). When he created the Legendarium he was stronger than, his opponents (except for the Dragon's Flame, with Winx's Bloomix.)

Uses of Magic

 * Infinite Chaos
 * "There's an empty page in the Legendarium with your name on it": He uses it to trap the Trix in the Legendarium.

Trivia

 * According to Greek mythology, the Acheron is one of the five rivers of the Greek Underworld. The spirits of the dead had to cross the Acheron on a boat to enter the Underworld.
 * The main Season 3 villain, Valtor, also wanted to become the greatest sorcerer of the Magical Universe.
 * He is the first villain who sometimes appears as voice only instead as a person.
 * He is the only villain who appears physically once.
 * Apparently, he can be considered the weakest antagonist because he has his physical appearance in only one episode but unlike Darkar and Valtor, he is only captured and not destroyed.
 * Acheron's voice actor also voices Riven and Rumpelstiltskin in the Nickelodeon dub.
 * Since the moment he got freed, Acheron is the only villain that was defeated the fastest.
 * In 2D, his eyes does not glow but in 3D, they do.

Voice Actors

 * Italy - Marco Bassetti
 * USA - Sam Riegel (Nickelodeon)
 * Latin America - David Silva