Archery

Once per battle
Effect: 

Once per battle, reroll one of your missed ranged attacks.

Adventurer Feat: 

Your Archery rerolls gain a +2 attack bonus and the attack's crit range expands by 1.

Champion Feat: 

Once per day, you can use Archery twice in the same battle.

Epic Feat: 

Once per day, you can turn a normal hit with a ranger ranged attack into a critical hit.