Title: The Emerald Knights, volume 6 - Onyx's Journal - Anne Robillard - book
Summary :
FACING THE PAST
Thanks to Kira, Knight Wellan discovers the renegade's journal and learns the fate that awaits his soldiers if the Black Emperor decides to adopt the same military strategy as before. Terrified, he tries to convince the Crystal Wizard to increase his magical powers.
Meanwhile, the sorcerer Asbeth sends a new enemy to attack Enkidiev. While the Knights come to the aid of the coastal inhabitants, Wellan has the opportunity to settle his score once and for all with the Elf King, and receives a priceless gift from the gods...
But he doesn't suspect that the enemy is much closer than he thinks.