Staff Expertise

Benefit: You gain a +1 feat bonus to the attack rolls of implement powers and weapon powers that you use with a staff. This bonus increases to +2 at 11th level and +3 at 21st level.
    In addition, when you make a ranged or an area attack with a staff as an implement, you don't provoke opportunity attacks for doing so.
    When you make a melee weapon attack with a staff, the weapon's reach for that attack increases by 1.

Published in Heroes of the Fallen Lands, page(s) 317, Heroes of the Forgotten Kingdoms, page(s) 318.