Knife-type weapon that can stab and slice. A Progressive Knife (often called "Prog Knife" for short) is a combat knife stored in the left shoulder pylon of an Evangelion which uses it, and is one of the Evas' basic armaments. The blade of the knife vibrates at an extremely high frequency[1], increasing its cutting sharpness to the point that it can cleave the matter of a target object at a molecular level.