Boomerang

A boomerang is a throwing weapon, notably used by Digger Harkness. His variety is a steel-made curved blade, sharpened on both sides and perforated by four prolongated holes. A boomerang, as thrown, spins about an axis that is perpendicular to its flight direction and is designed to return to the thrower.

History
Harkness threw a steel boomerang above a man's head, only for it to return and stab him in the back.

Known users

 * Digger Harkness