Luck

 is one of the seven Primary Statistics in the SPECIAL character system.

Fallout, Fallout 2, Fallout Tactics
In Fallout, Luck primarily affects your chances with the virtual dice of the game: a high luck means you're more likely to succeed a roll, while the opposite is also true. Luck also affects the chance to score a critical hit on an enemy, with the standard being that your Critical Chance is equal to your luck (keep in mind, standard means without perks, traits, or aimed shots). It also determines the initial level of your Gambling skill.

Ways to increase Luck in Fallout

 * Chuck in the Boneyard - Adytum can increase your Luck permanently by one point via the mysteries of the Tarot.

Ways to increase Luck in Fallout 2
(Killing the pariah dog before it joins the party will also increase your luck. The thing is, you can't find it whenever you want. )
 * The Hubologists can be visited to gain a luck bonus. Only one bonus can be gained, though they have two bases, one in the NCR and one in San Francisco. The NCR bonus can either boost Luck by 2 or reduce it by one, and the Frisco one can either boost Luck and Intelligence by 1, or reduce luck by 1.
 * Taking the Gain Luck perk for an increase of 1 Luck.

Fallout 3
Modifies: All Skills, Critical chance. Unlike other S.P.E.C.I.A.L. scores, Luck has no specific skills associated with it. Instead, every two points of Luck adds one point to all skills. Having a high Luck will also improve your critical chance with all weapons.

Ways to increase Luck

 * The Luck Bobblehead, in the cellar of Arlington House, permanently increases Luck by 1.
 * The Intense Training perk will allow you to increase your Luck (or any other S.P.E.C.I.A.L. stat) once for each time that you take it.
 * The Lucky 8 Ball also increases Luck by 1 as long as it's carried. The Lucky 8 Ball can only be obtained by saving Timebomb via surgery (Medicine 40 required) in Big Town, and then saving the town after rescuing Red. After you help save the town, talk to Timebomb and he will reward you with the Lucky 8 Ball.
 * Certain pieces of apparel, such as the lucky shades, Naughty nightwear or Ranger battle armor, can increase Luck while worn.
 * The Broken Steel add-on perk Almost Perfect raises all S.P.E.C.I.A.L. stats to 9 if it isn't already 9.

Fallout: New Vegas
Luck functions in the same manner as Fallout 3. It raises the value of every skill (see chart at bottom of page) and affects critical chance. It also improves the odds of winning at any casino game; the higher the luck, the more likely favorable outcomes on bets will be. If you win a casino bet through the influence of Luck, you receive a "You feel lucky" message. A minimum Luck of 7 is usually required to win with any regularity, otherwise the house will usually win. However, even with a Luck of 7 the house wins about 50% of the time.

Ways to increase Luck

 * You can purchase the Luck Implant, an implant that improves your Luck, for 4000 bottlecaps at the New Vegas Medical Clinic.
 * The Intense Training perk will allow you to increase your Luck (or any other S.P.E.C.I.A.L. stat), once for each time that you take it, up to a maximum of 10.
 * Wearing the legendary Naughty Nightwear also grants a +1 bonus to Luck. It can be purchased from Mick over at Mick & Ralph's in Freeside, or stolen through the bars of his special inventory.
 * Wearing the Lucky shades also grants a +1 bonus to Luck. The Lucky shades can be found inside the Caesar's Legion safehouse, on a bed with a suit of Legion praetorian armor, a Displacer glove, and two Time bombs. However you must have the reputation 'Liked' or higher with the legion. (the glasses were only added to the game after the 1.2 patch, so make sure to install it before trying to get these glasses)
 * The Meat of Champions Perk grants you a +1 bonus to Luck. It also boost your Strength, Intelligence and Charisma by 1 point. This secret perk can be obtained by eating the corpses of Caesar, Mr. House, The King and President Kimball after killing them, which is possible if you have the Cannibal perk.
 * Upon completing the Lonesome Road (add-on), you are granted with a selection of one of one of your S.P.E.C.I.A.L. stats, including Luck, to be raised by one point.

Level names and statistics
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