Chronicles of Dragomir. Book 3. Among the Fragments

The adventures of Luna in the magical world of precious stones continue!
 
After a complete victory over the sorceress, Dragomir returns to a peaceful life. Luna is learning magic in Saphirine — diving into the aquatic world with all its wonders,... secrets, and mysteries of the sea depths, — while her friends prepare for their graduation trials. The exams are not a mere formality: those Dragomirans who pass them successfully will be able to participate in the duels conducted by Essantia — the creator of Dragomir, its soul and essence. She rewards the winners with incredible abilities. Hyacinth, the father of Ametrine and the right hand of Heliodor, unexpectedly forbids his son to participate in the greatest trial of the year. Ametrine does not listen to his father and prepares for the duels in secret.
 
But why does Hyacinth so vehemently oppose his son's participation in Essantia's competitions?
 
Chronicles of Dragomir. Book 1. Beyond the Radiance
Chronicles of Dragomir. Book 2. In the Shadow of Obsidian
Chronicles of Dragomir. Book 3. Among the Fragments
Chronicles of Dragomir. Book 4. On the Other Side of the Abyss