Which Legendary weapon do you want to see in the full game?
Fist of Rukt as a legendary Gravity Hammer.
Anybody
Can someone figure out a way to make a legendary Spartan Laser (preferably green)?
The halo 1 magnum 
The mother friggin’ Needle Rifle and Focus Rifle!!!
I want that -Yoink- back
DISCLAIMER: This is my friends idea, he gave me permission to repost it here.
Loving this!
As Legendary Weapons are supposed to be actual, specific weapons, rather than just powerful but mass-produced models, I think we need to look at potential ones as more than just things like the SPNKr line of rocket launchers or the M6D series of pistols, and focus on individual guns which hold a specific place in the canon. As a few ideas so far, beyond those suggested above:
Captain Keyes’ M6D
This is the first weapon that the player ever gets to use in the series (and therefore, quite possibly the first weapon a lot of players ever used in a shooter!) and therefore it would do very nicely for a ‘Legendary’ version of the classic pistol.
Weapon Name - Keyes’ Pistol
What Makes it a Legendary - 3 shot kill and ability for damage to bleed through shields, fast firing speed, and large magazine
Specialties in Animation - Complete classic set, including pistol whip and idles
How to balance this weapon out - Suffers from surprisingly poor accuracy
Appearance - Original M6D model with increased polygon and textures levels
Sergeant Johnson’s M6 G/GNR
The Spartan Laser has unfortunately gone through a bit of a decay since it was introduced in Halo 3, first having its charge time increased in a title update, then having its battery reduced in Reach, and by the time of Halo 4 it wasn’t even a particularly useful weapon for destroying vehicles, even when it was available at all. As the weapon that destroyed 343 Guilty Spark, Johnson’s laser needs no such nerfs!
Weapon Name - Orion Laser
What Makes it a Legendary - Faster charge time, larger battery, increased damage, and ability to penetrate vehicles
Specialties in Animation - Complete classic set, plus any Spartan holding the laser acquires a cigar complete with puffs of smoke on kills
How to balance this weapon out - Don’t, the standard laser actually needs a buff as it is
Appearance - Halo 3 model with improved polygon count and textures, plus an elite skull and kill count scratches on the side
Infection Shotgun
Only essentially a semi-canon weapon, the survivor’s Shotgun has been a staple of the Infection gametype ever since Halo 2, and was eventually given its own variant in Halo 2: Anniversary. There have been plenty of famous shotgun rampages throughout Halo, particularly on Flood levels, and so simply branding it as a shotgun that saved its owner’s life many times against the swarm would do nicely as backstory.
Weapon Name - Survivor’s Shotgun
What Makes it a Legendary - Longer range and increased damage combined with faster reload speed
Specialties in Animation - Faster reload animations and unique assassinations
How to balance this weapon out - Larger pellet spread and no ability to replenish ammunition
Appearance - CE:A/Reach model with weathering and flecks of blood and biomass over it, particularly so nearer to the front
Noble Six’s Assault Rifle
Noble Six wielded an Assault Rifle to great effect during the last battle on planet Reach, its fire still capable of downing multiple Elites despite taking enough plasma damage that even Six’s Mjolnir armour had begun to fail. Though lacklustre in gameplay, during the cutscene of Six’s final stand this particular rifle proved the equal of those encountered in Combat Evolved, and along with Six’s helmet, may have survived Reach’s glassing.
Weapon Name - The Last Stand
What Makes it a Legendary - 60 round magazine, increased accuracy and fire rate
Specialties in Animation - Similar animations, but firing and reload sounds are scratchier and clankier to represent damage
How to balance this weapon out - No ability to use smart scope, plus the ammunition counter/compass is cracked and inert
Appearance - Same model as Reach, but weathered and rusted to reflect damage taken in Six’s final stand and the subsequent years of exposure to the elements without care
A Precursor weapon that’s part biological, like the Republic Commando Geonosian Elite weapon.
You heard me.
How about a shotgun filled with flood goo and it should be call the shotflood.
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You don’t need balance to things like that Magnum. It’s a Legendary for a reason.
Fist of Rukt
CE Magnum
CE Shotgun
CE Assault Rifle
Dual-wielded SMG
Flood injection: turn your spartan into a Flood combat form, complete with whipping arms. Gives you super jump and extra range for a very powerful melee. Also can infect other spartan corpses to make an army >:)
Arbiter (HW) swords: dual-wieldable w/ nice shiny hand protectors. Lets player slash twice as fast and while sprinting, clambering, or sliding.
Regret’s chair
Monitor laser (bring back both sentinel beams from H2 [non-legendary] and add this one, which is you holding a monitor and shooting his laser XD )
Enforcer mortar and needle gun (again from H2, don’t have to be legendary per se)
Cortana: ability to hack another player’s armor systems LOL
They should put in the ability to un-mount guns (not break the gun) and reposition them (but while you are moving it, you can’t shoot it, so move it wisely)
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> Flood injection: turn your spartan into a Flood combat form, complete with whipping arms. Gives you super jump and extra range for a very powerful melee. Also can infect other spartan corpses to make an army >:)
>
> Arbiter (HW) swords: dual-wieldable w/ nice shiny hand protectors. Lets player slash twice as fast and while sprinting, clambering, or sliding.
>
> Regret’s chair
>
> Monitor laser (bring back both sentinel beams from H2 [non-legendary] and add this one, which is you holding a monitor and shooting his laser XD )
>
> Enforcer mortar and needle gun (again from H2, don’t have to be legendary per se)
>
> Cortana: ability to hack another player’s armor systems LOL
>
> They should put in the ability to un-mount guns (not break the gun) and reposition them (but while you are moving it, you can’t shoot it, so move it wisely)
Who want to sit on the regretf
Fist of Rukt for sure. As for any others, my mind is blank.
Brute Shot
Then we can be Meta again
Fist of rukt
CE pistol
Halo 2 duel smg’s
and bring the reach grenade launcher back
Fist of Rukt
CE Pistol (as a unlockable skull & available for multiplayer)
Halo 2 Duel-SMGs
Scarab Gun
Brute Shot
I prefer the exotics.
Kats magnum - picking it up makes you ultimately useless and annoying till you get your brains blown out.