The Opakan are a race of contract killers with white eyes that live underground in the ruins of a forgotten city. They train from birth to be unrivaled warriors and it is whispered that if you ever do see the white eyes of an Opakan then that is likely the last thing you will ever see. Ayrion is a young Opakan who was born with a gift for magic as well as being a repeater, which means that he need only be taught something once for him to be able to flawlessly repeat the action. This makes him an incredible fighter and his skills should allow him to become the youngest Opakan ever to pass the warrior test, which is his goal. However, his astonishing skills also make him a target for the other young Opakans who resent his abilities and there are those with power who want to see him fail. This is a coming of age story that could easily been considered a YA book but it never insults your intelligence and it is easy to get wrapped up in discovering Ayrion's world from his limited perspective.
Banished - book one of the Street Rats of Aramoor series