SRD:Unerring Accuracy (Epic Weapon Enhancement)

Unerring Accuracy
Ranged attacks made with this weapon negate the AC bonus granted by any cover short of total cover. The weapon’s ranged attacks also ignore any miss chance from concealment (including total concealment, but the must still aim his or her attacks at the correct square).

Caster Level: 21st; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, true seeing; Market Price: +6 bonus.