Krystal attempts to heal Sky's memory, but the memory of losing the pendant of Eraklyon is causing the blockage, but only Sky knows where it can be found. Timmy helps Tecna update her phone to find the Sirenix Book, which the Trix secretly sabotage. While, searching for the Sirenix Book, the Winx find the fake one, which turns Tecna into a terrifying robot, whose mission is to find the Sirenix Book. The Winx find it difficult to stop her, but thanks to a powerful book that releases a whirlpool of water, Tecna is restored to normal, and the Winx officially find the Sirenix Book. Meanwhile, in the Ocean, Nereus and Queen Ligea seek Tritannus and find him, but he turns Nereus into one of his mutant henchmen and threatens his mother to tell him about Sirenix, so she tells him what little she knows and he calls her useless, turning her into one of his mutant henchmen as well.