A Covenant Energy Sword.
The Energy Sword is almost only wielded by Elites, and specifically Elite Zealots or higher castes. It is made of some plasma-like energy that can slice through energy shields and ballistic armor alike. The Energy Sword is the trademark melee weapon of the Elite forces, and also the Arbiter.
From Halo, duh.
100% freehand, the handle looks a little wierd, but you can barely see it, and the main focus is the blade.
A model, again this icon is based off content from a franchise, not the model.
(http://www.hiveworkshop.com/forums/models-530/covenant-energy-sword-135298/)
UPDATE 1: Now glows
Keywords:
Energy, Sword, Blade, Covenant, Alien, Elite, Zealot, Arbiter, Glowing, Plasma, Blue, Halo