Staff Expertise is a heroic tier feat available to all player characters.[HotFL:317][HotFK:318]
A character with the Staff Expertise feat gains a feat bonus to the attack rolls of implement powers and weapon attack rolls using a staff equal to +1, or +2 at 11th level, or +3 at 21st level.
In addition, when you make a ranged attack 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.