Valtor and Obscurum intend to attack a new star, Syderia, and to do so they decide to adapt a different strategy: deception. Obscurum goes to Syderia, and while all the lumens of the star are asleep, He cast a spell on them. He then sends the staryummies to drain the core of the star. Meanwhile, at Alfea, Twinkly informs the Winx that Syderia is under attack. When the Winx come to the rescue of Syderia, they discover that the lumens that inhabit the star are convinced that the fairies have come to steal the treasure of their star, and the Winx are forced to escape them and hide.