The Legend of the Life Crystal

In this book, a Legend about a crystal that controls all life had been destroyed and stole it's shards were stolen by the Satan Boys Gang. A boy named Chris, who was the grandson of a great hero named Nicholas, was called to be the world's hero before the Satan Boys Gang can make the shards form the Death Crystal, which opens the pathway to hell. So Chris must save the world, cause it's in his own hands.