Darkstar

Mike Darkstar is a young 15 year old who is from a high lighted family in his world of magic. Years ago, a criminal named Lord had caused havoc and no force seemed to be strong enough to stop his mass murder which he had caused with the desire to rule the world. When the people could no longer face his wrath and decided to surrender, Mars Godstar, Mike's grandfather resolved to face Lord and vowed to vanquish him for once and for all. Mars faced Lord with immeasurable bravery and courage and managed to defeat him and kill his body but not his spirit. He imprisons Lord's spirit in one of Lady Godstar, Mike's grandmother's best invention a magical cartridge in a magical belt. Unfortunately, after his victory he vanishes from the world leaving no sign.
In the beginning everyone except his coach, Alaster, is oblivious to his strength which is revealed when Mike wins the World Battle-Talent Search Tournament by defeating the champion Gwen, his friend. After his win he goes to join his father in the battle against Krum, Lord's general.
The book closely describes the events that take place and the battle between Mike and Krum and the surprising end to the book.