Advancement Table Level XP Req'd Effect First 400 Add'l Accuracy Second 1,100 Add'l Accuracy Third 2,900 Add'l Accuracy Fourth 8,000 Add'l Accuracy Fifth 20,500 Add'l Accuracy Sixth 39,000 Add'l Accuracy Seventh 81,000 Add'l Accuracy

Accuracy defines your precision in ranged combat, and hence the amount of damage you can cause with a ranged weapon.