Auzou Book for the unicorn fight tome 2 the scarlet witch

Aélig, Hiyama and Kalyane set off to attack the suspended city, hidden in the clouds, where Illana is being held. The Princess of Aurora, dear to Aélig's heart, has been kidnapped by the mysterious Scarlet Witch. But the path to the fortress is perilous, and they face dangers they never imagined...