Khopesh

A khopesh is a type of sword that was used by ancient Egyptians. They were curved, and usually were up to two feet long. The khopesh was designed specifically to hook an enemy's weapon.

It is the Egyptian name of the Canaanite "sickle-sword", in Assyrian known as sappara. Its origins can be traced back to Sumer of the third millennium BCE.

The Red Pyramid
Throughout The Red Pyramid, Carter Kane utilizes a khopesh, which he grabs off the wall of Brooklyn House to defend himself when demons 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. 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 accuratly throwing the sword from a distance into him as he's about to kill Sadie.

The Throne of Fire
Carter lost his khopesh in the Winter Palace. Horus is mentioned to have this weapon too.

In the Serpents Sadow he substitutes his koseph for the crook and flail.