Just to prevent any doubts:
- It's very possible to miss with Magic Star Cannon, esp if the mage doesn't have 'Mystic Mentor' talent combo and the archer is running AGI+9 stones/assasin's finger gun/has lightning reflexes up.
- Stun resistance is a very 'real' thing that has been implemented in PvP to prevent perma-locking. This does not apply to stun effects from equipment, talents however. Only skills.
The only form of 'stun' mages can use on other players is 'Magic Star Cannon'. This is a special type of stun that creates a dizzy effect that can be easily removed by attacking the player. This can make weakly-geared 18 bow archers sometimes a benefit to the opponent's team's warriors (cause they break stun and do negligible damage).