Staff

A staff is a common magical focus.

Description
Staves are usually wooden, three to six feet long, and engraved with runes. They are often used as magical foci by wizards. The proper hand to carry it is the left hand. By definition, a staff can also serve as a cane, or as a weapon; a cudgel.

Harry Dresden considers his staff the most versatile of all his foci. It's meant simply to aid in the redirection of forces used to: call wind, bend steel bars, channel lightening, erect barriers of force, disrupt hostile magics—and sometimes uses it as a big stick for hitting things. From Blood Rites through White Night, Harry can access Hellfire through it.

Grave Peril
In Grave Peril, Harry has a newly carved staff.

Blood Rites
In Blood Rites, Harry uses it as a lance boosted with force magic directed at Lord Raith's guards' car that was blocking the road to the Deeps with Karrin Murphy on her Harley at high speed. The force was shooting out of ahead of them in blue and purple flickers of flame and it blasted the vehicle out of their way.

Changes
In Changes, the Ik'k'uox smashed the Blue Beetle together with Thomas Raith's white Jag. Harry's staff was in the car.

Skin Game
Between Cold Days and Skin Game, he had constructed a new staff on Demonreach using implements left over from the construction of the What's Up Dock.