Whatever you want! There are only two rules: it must be possible using the technology of the Halo universe, and it must be light enough to be carried by a SPARTAN-II or Elite.
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A Forerunner Handheld Weapon that you have to fight hordes of Crack Covenant Elites to get at. You disable the energy sheild surrounding it. (Dramatic Halo Music Plays) The Gun is silvery-blue, much like Forerunner architecture. It looks simialar to a fuel rod gun, but doesn't go on your shoulder. You place your forearm inside the hollowed-out cavity in the back. The gun floats for a moment, glows a brilliant blue-white, then settles and locks onto your hand. The gun uses pure energy from a black hole trapped inside. The primary fire shoots a solid beam of pure white-blue energy at light speed, and can fire every second or two. The secodary fire (hold down the trigger) is a charged shot. Four energy casings pop out the side, one after another, 4 on each side, in pairs. They light up to a blinding white, and then you release the "trigger" (The gun is controlled with your thoughts) There is a huge explosion that kills everyone around you, but you are protected.