The 501st Legion, later known as "Vader's Fist" and the Five Hundred and First, was an elite unit of clone troopers commissioned by Supreme Chancellor Palpatine during the Clone Wars that later became a stormtrooper unit. Made up of units like Torrent Company, the 501st fought in many battles, such as the Battle of Teth and the Battle of Coruscant, becoming one of the most well-known legions. In 19 BBY, the 501st became Darth Vader's personal unit as he led them during Operation: Knightfall, in which the clones helped take down the Jedi, whom they believed to be traitors to the Republic.

Following the rise of the Galactic Empire, the 501st transitioned into a stormtrooper unit, like all other clone units. Given new armor and weapons, the 501st faithfully served the Empire, operating under the direct command of the Sith Lord Darth Vader. After the Battle of Kamino, the 501st became the last remnant of the Grand Army of the Republic fully composed of Jango Fett clones, as opposed to the ever-growing and more diverse Stormtrooper Corps, where the Fett clones became a minority with the inclusion of a pool of clones from different templates and birth-born recruits.

The legion fought in a number of battles during the Galactic Civil War in an effort to defeat the Rebel Alliance and bring peace to the galaxy, although the Alliance ultimately triumphed.

DEXTERITY: 4D
   Armor Weapons: 5D+2
   Blaster: 6D+1
   Brawling Parry: 5D+2
   Dodge: 6D
   Grenade: 5D+2
   Melee Combat: 6D
   Melee Parry: 5D+2
   Missile Weapons: 5D
   Vehicle Blasters: 4D+2
PERCEPTION: 3D
   Bargain: 4D
   Command: 5D
   Con: 4D+2
   Gambling: 4D
   Hide: 5D+2
   Investigation: 6D+1
   Persuasion: 5D+1
   Search: 6D+2
   Sneak: 5D
KNOWLEDGE: 2D+2
   Alien Species: 5D+1
   Bureacracy: 4D+2
   Cultures: 5D+1
   Intimidation: 6D
   Languages: 5D+2
   Planetary Systems: 5D+1
   Streetwise: 5D+2
   Survival: 6D
   Value: 5D+2
   Willpower: 6D
   Tactics: 5D
  
STRENGTH: 3D+2
   Brawling: 6D+1
   Climbing/Jumping: 5D+2
   Lifting: 5D
   Stamina: 6D+1
   Swimming: 4D+2
MECHANICAL: 2D+2
  
   Jet Pack Operation: 6D
   Repulsorlift Operation: 4D+2
   Starship Gunnery: 6D
   Starship Shields: 5D+2
   Sensors: 4D
   Walker Operation: 6D
TECHNICAL: 2D
   Armor Repair: 5D
   Computer Programming/Repair: 4D+1
   Demolition: 6D+2
   Droid Programming: 3D
   Security: 6D+1
   Space Transport Repair: 4D+1
   First Aid: 6D
   Explosives: 5D

Equipment: DC-15S blaster carbine 5D+2
DC-15s Heavy Blaster Pistol 5D
Phase 2 CloneTrooper Armor (+2D Physical, +1D Energy, -1D Dexterity, -1 Move)