Are you sure it boosts my weapon damage ? Wiki says "The Damage bonus from Combat Discipline affects non-weapon based (ie, spells) combat arts fully, but for weapon-based combat arts it will only boost the bonus damage from the CA (eg, if Battle Extension is giving you an additional +20% damage, Combat Discipline will affect that +20%, so if CD gives you +10%, a player will end up with +22% damage bonus from Battle Extension)." Now I am really confused.