Elves: The Black Blood of the Sylvan Elves (Elves #17)

Ilaw is seven years old when his parents give him up. It is his uncle, an illegitimate child of Sylvain and Blue Elves, and the captain of a ship, who raises him instead. Over the years, the young elf forgets his former life in the forest.

After more than a decade at sea, navigating from port to port, his uncle is killed by ghouls, and Ilaw is left on his own. Running away, he meets Ora, Queen of the forest of Duhann.

Finally, he has found a new family, a new clan, until Dark Elf assassins reveal to him the terrible secret that has tormented him, and the reason why his parents formerly abandoned him...