Grumpy Scot

Question: In the opening to the movie, when the Army of Anubis first appears, you see a man fall headless and Anubis himself (or at least what appears to be the Army's leader) steps on the body, sweeps his weapon over it, and howls into the air. What is that weapon? Is it real or invented for the movie? The same character wields the same weapon later when the Army faces the Magi, and Imhotep wields the same weapon against Rick O'Connell's dual axes in their fight before the Scorpion King shows up. Any idea? I gotta know what that weapon is. (00:03:50 - 01:45:55)