The Winx Club try to find the creature of the Rainbow Mantle to earn the boon of the Ancestral Spirit of Nature. The Trix attack Stella, Musa, and Tecna, and Bloom, Flora, and Aisha defend them. Bloom saves a horse, who reveals itself to be the Creature of the Rainbow Mantle when the Trix try to attack it. It heals the Winx, and they win the competition. Upon opening the Sirenix Book, they are given Sirenix guardians and learn they must earn Sirenix before the next lunar cycle ends. To begin their quest, they must first find mystical gems known as the Gem of Self-Confidence, the Gem of Empathy, and the Gem of Courage. The Sirenix Guardians grant them a new transformation, Harmonix, to help them with their quest.