Grand Weaponmastery is a Kai . While the Kai Discipline Weaponskill grants +2 Combat Skill and Magnakai Discipline Weaponmastery grants +3 Combat Skill with the selected weapons of choice, the bonus do not stack. A Kai Grand Master with Grand Weaponmastery gains +5 Combat Skill with a weapon they are proficient in. A Kai Grand Master with Grand Weaponmastery may add 5 to any number he/she picked from the Random Number Table when using the Bow. As a loyalty bonus to readers, Lone Wolf can still benefit from earlier disciplines in weapon without mastering Grand Weaponmastery as long as he acquired them in earlier books.