This papercraft is an Omni-Blade, an omni tool highlighted by an orange glow, based on the game Mass Effect 3, the paper model was created by PepMaster. The finished model is about 37.2 cm long, and there are 53 parts on 11 pages.
Like other omni-tools, the omni-blade is a hologram projected over most characters arm. It is similar to other omni-tools, however, the omni-blade can be used to attack enemies. When in close combat you will be able to pierce through enemy armor and deal a large amount of damage, if not taking them down in a single blow.
The omni-blade has different animations when used by different classes such as a stabbing motion for Soldier class to a double swipe for Sentinel class.
You can download the papercraft model template here: Mass Effect 3 - Omni-Blade Free Papercraft Download