Once Upon a Darker Time. Chronicles of the Secret Prince, #2

Deston Lespérance assumed that once he had defied the odds and bested Grossard, the malicious solitary faerie who imprisoned his parents, he and his family would live happily-ever-after in the land of Tir na-nÓg. He wanted that so badly it never occurred to him that that scenario only happens in the movies and fairy tales. In the real world the villain doesn't always die. Sometimes the villain even returns with a vengeance and threatens to unleash a darkness that will destroy the fae and the high realm forever.
Knowing he barely made it out alive the last time he faced Grossard, Deston isn't anxious to do it all again. But evil and destiny waits for no one. So, ready or not, Deston heads out on another epic adventure to locate and destroy the Shard of Erebus before Grossard and his new partner, Mordred, find it. With only his dreams to guide him and Margaux to help figure out the clues, his challenge is extra daunting because the stakes are higher than ever.
But even knowing all that, he still never imagined the sacrifices he would be required to make. As Deston's world crumbles around him and his friends fall, the one glimmer of hope he hangs onto is that the fae powers and strength reside within him and he can become the hero the fae believes him to be.