Secret Guardian.After returning to Alfea, Bloom researches the Ring of Solaria, hoping to find out what made the Trix go to such lengths to get it. Meanwhile, the Trix use a spell on the ring, hoping to access an extremely powerful magic known as the Dragon Flame, only to have their spell blow up in their faces as the ring proves negative! An infuriated Icy throws the ring away and plans to begin the search all over again. Back at Alfea, Bloom learns more on the ring of Solaria, but also learns about the Dragon Flame. Bloom then turns to Faragonda for answers, who tells her that the Dragon Flame was the energy of the Great Dragon, who created the magical universe and later rested on the planet Domino. That night, the Winx plan to infiltrate Cloud Tower to retrieve Stella's ring (since she can't transform without it). Using the same secret tunnel the Trix used earlier, the girls sneak into Cloudtower without a hitch while the Trix are out. After searching their room, Stella finds her ring, but the tunnel doesn't reopen and the Winx are forced to find the main exit without getting caught. While exploring, the Winx stumble upon Cloudtower's archive which contains history on every person in the Magic dimension. A curious Bloom spots a book with her name on it and tries to read more on her past, but quickly regrets it when it turns into a trap that alerts Headmistress Griffin! The Winx try to make a hasty escape, but Griffin sends Bako monsters to scare them out! After using their magic to fight the monsters, the Winx are led to a dead end. In a panic to destroy the last monster, Stella accidentally sets the room on fire! As the Winx begin to suffocate, a mysterious voice guides Bloom to an exit, allowing them to leave Cloudtower. Though the ring was recovered, the Winx are busted since Griffin already called Faragonda hours ago. As punishment, Faragonda temporarily extracts all their powers.