The Halberd is a type of polearm wielded by soldiers in Europe during the Middle Ages, and during The Crusades. Dante Alighieri is seen wielding the generic weapon in Acre, but discards it in favor of Death's Scythe.
Prior to the prisoner riot in Acre, the halberd was originally hanging on a wall. However, Dante is shown taking the weapon down and wields it adeptly during the raid. Later, after being stabbed by an assassin, Dante uses the weapon against Death before stealing his Scythe turning it against him. The Halberd is an otherwise meaningless weapon and was quickly discarded in favor of the stolen weapon.