Harry Dresden's cane sword

Harry Dresden owns a cane sword, with a thirty-inch-long steel blade, inscribed with runes allowing it to channel earth-based magic, namely magnetism.

In the series
Harry Dresden uses this sword, without magic, in a short struggle against Donald Morgan.

Grave Peril
In Grave Peril, Dresden is first seen wielding this sword at Bianca's Ball for the Red Court.

Blood Rites
In Blood Rites, Harry Dresden uses the sword's magic during the final battle against Lord Raith.

Turn Coat
In Turn Coat, Donald Morgan uses it when Anastasia Luccio comes to to Dresden's apartment and gets into a fight with Molly Carpenter. Morgan uses the cane to force off the girl, pointing it at her carotid artery until Dresden shows up.