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Jinx shot
Bard Attack 1

Your expert shot renders your foe unaccountably clumsy.

Ranged weapon

Target: one creature

Attack: Charisma vs. AC

Hit: 1[W] + Charisma modifier damage. The first time the target misses with an attack before the end of your next turn, it falls prone.
Level 21: 2[W] + Charisma modifier damage.

Jinx shot is an at-will power available to bards at 1st level.[AP:6]