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A khopesh is a type of sword that was used by ancient Egyptians. They are curved and usually are up to two feet long. The khopesh design is made specifically to disarm an enemy by hooking the weapon. It is mentioned that it was a favored weapon of the protectors of the pharaoh, and it is Carter's weapon of choice too. It is evolved from battle axes and has been described as a 'wicked, curved sword.'
Carter Kane utilizes a khopesh, which he grabs off the wall of the Brooklyn House armory to defend himself when two serpopards appear. He continues to use it until he loses it at Luxor. While battling the Set animal, Carter reaches through the Duat to summon his khopesh. Only a little while after Carter realizes that he is hosting Horus, Horus tells him a better way to hold the khopesh. Carter tries it and it works. He uses it throughout the rest of the book, battling Set with it and killing several demons with it. In the end, he kills Face of Horror by accurately throwing the sword from a distance as the demon is about to kill Sadie.
Carter lost his khopesh in the Winter Palace when he and Sadie were sneaking in to get the Book of Ra. Carter did not have it for his and Sadie's fight with the tjesu heru. Horus is mentioned to have this weapon too.
Carter initially uses his khopesh against a monster hippo sent by Apophis, but after stabbing the hippo in the ear with it, he loses the sword and believes it has fallen to the bottom of the Nile River. He finds that for some reason he is unable to summon it from the Duat. While wishing for another weapon, Carter later receives a feather. Trying again, he receives Ra's crook and flail, the weapons of the pharaoh, and uses them instead.
The khopesh seems to be magically enhanced in hardness, as in the books the blade has displayed unnatural hardness. It can be used in casting spells, such as when Carter uses his khopesh to cast the ha-tep spell on Freak. Also if the blade is stabbed into the ground, the user can create a shielding spell in the form of a blue barrier of light. It can also be used to hook the victim's neck, as Carter used it in The Throne of Fire. As mentioned, it can be used as a staff to cast spells.