It's more like the Halo 3 Brute Shot, just reskinned.
Idea for a weapon: The Gravity Gauntlet
It's shaped similar to the one of the Didact's gauntlets (hand/wrist armor) that wraps around the user's right hand, with four "nodes" floating around the hand; two in the back, two in the front. The back ones are tethered to the front ones by hard light.
Sandbox Role: Vertical map movement, enemy player stun, weapon control
The Gravity Gauntlet's primary role is grabbing weapons, grenades, and so on from a distance. The range is only about two and a half Warthogs parked bumper-to-bumper. The Gauntlet runs on a battery, with more charge being depleted depending on the distance of the weapon you grab. Your crosshair has to be aimed directly on the weapon, at which point you're prompted to switch. It flings the weapon at you, swapping your Gauntlet out for whatever weapon you picked up; however, you can cheat this by switching to your secondary weapon as the weapon gets close to you and then switch back to the Gauntlet.
A secondary role is stunning enemy players; if your crosshair goes red on an enemy, you can aim your hand at them with an open palm (similar to the Didact's force choke) and completely stun them. They can still fire, aim, and shoot grenades, but are stuck in the same physical position - even if they're in midair. Stunning a player eats up a whopping 5 battery per second - overheating after 5 seconds, the only instance where this weapon will overheat. It's mostly useless in 1v1 situations because you have to stay still to effectively maintain the charge (holding right trigger, looking, and moving would probably slip your crosshairs off the enemy) and you're setting up a perfect line of sight for your stationary enemy while you can't shoot, but has potential uses in team games. Examples include stunning a flag carrier, disabling someone being chased in midair so your teammate can assassinate them, preventing them from winning a race to a power weapon, rendering your enemy immobile so a teammate can splatter them, etc.
A tertiary role is vertical map movement, replacing the Jet Pack; on maps the Gauntlet is specifically designed for, "Hardlight Hooks" can be latched on to, allowing your Spartan to fly towards them as if you were using a grappling hook. These hooks can be placed in Forge and may vary if it's an objective gametype. Note that this hooking feature eats up battery.