Halfling Luck

Halfling Luck is a passive feature in Baldur's Gate 3 that grants all halflings to reroll a dice when it lands on a 1 for an Attack Roll, Ability Check, or Saving Throw.

Description

When you roll a 1 for an Attack roll, Ability check, or Saving throw, you can reroll the dice and must use the new roll.

How to learn

Races:

• Character level 1: Halfling

(Character level is the sum of all class levels for a multi-classed character.)

Notes

• It is possible for the new roll to be another 1.
• As of patch 6, when rolling with advantage, the following rules apply:
  • If one dice rolls a 1, it's re-rolled, and the higher of the two dice used.
  • If both dice roll a 1, they are both re-rolled, and the higher one used.
• The chance to hit displayed when hovering an attack on an enemy doesn't take into account Halfling Luck.
• Halfling Luck is unique as a racial feat in that it cannot be replicated by any item, spell or racial ability in the unmodified version of the game. Although other racial feats and abilities can be replaced (or at least approximated) by use of items and/or spells, Halfling Luck has no such equivalent.
• Halfling Luck is particularly useful to avoid failures for ability checks and saving throws when the roll would only fail on a critical miss.
  • On a normal roll that succeeds on a 2 or more, Halfling Luck would reduce the chance to fail from 1/20 to 1/400.
  • On a roll with advantage that succeeds on a 2 or more, Halfling Luck would reduce the chance to fail from 1/400 to 1/160000, making it practically impossible to fail. With Karmic Dice active, it may be simply impossible to roll 4 critical failures in a row.
  • Traders can get all their easy to steal item stolen without fear of missing a single roll.
    • Be mindful that it can make your character  Heavily Encumbered which gives disadvantage on all ability checks, including further pickpocket attempts.
  • Stealth checks can get pretty much guaranteed to succeed.
  • Also useful to avoid Concentration getting interrupted too often by constitution save critical misses when taking low damage.

Math

Chances of succeeding a specific roll

See Advantage math section for comparison.

Chance of rolling a target number or above on 1d20 with Halfling Luck

Target on 1d20	Luck Normal Roll	Luck with Advantage	Luck with Disadvantage
1	100%	100%	100%
2	99.75%	99.9994%	99.5%
3	94.50%	99.7%	89.3%
4	89.25%	98.84%	79.66%
5	84%	97.44%	70.56%
6	78.75%	95.48%	62.02%
7	73.5%	92.98%	54.02%
8	68.25%	89.92%	46.58%
9	63%	86.31%	39.69%
10	57.75%	82.15%	33.35%
11	52.5%	77.44%	27.56%
12	47.25%	72.17%	22.33%
13	42%	66.36%	17.64%
14	36.75%	59.99%	13.51%
15	31.5%	53.08%	9.92%
16	26.25%	45.61%	6.89%
17	21%	37.59%	4.41%
18	15.75%	29.02%	2.48%
19	10.5%	19.9%	1.1%
20	5.25%	10.22%	0.28%

Chance to hit comparisons

On a normal roll, Halfling Luck multiplies the chance to hit by :

• 1.05 whatever the target roll is
  • This would be the most noticeable for a target roll of 2 which would add a flat 4.75% chance to hit or almost +1 on a d20.
  • For a target roll of 20 it would add a flat 0.25% chance to hit, which would be a critical success.

On a roll with Advantage, Halfling Luck multiplies the chance to hit by :

• 1.003 for a target roll of 2 or a flat +0.25% chance to hit
• 1.01 for a target roll of 3 or a flat +0.70% chance to hit

...

• 1.03 for a target roll of 11 or a flat +2.44% chance to hit

...

• 1.05 for a target roll of 20 or a flat +0.47% chance to hit, which would be a critical success.

On a roll with Disadvantage, Halfling Luck multiplies the chance to hit by :

• 1.10 whatever the target roll is
  • This would be the most noticeable for a target roll of 2 which would add a flat 9.25% chance to hit or almost +2 on a d20.
  • For a target roll of 20 it would add a flat 0.03% chance to hit, which would be a critical success.

Chance to fail comparisons

On a normal roll, Halfling Luck divides the chance to fail by :

• 20 for a target roll of 2
• 1.82 for a target roll of 3
• 1.40 for a target roll of 4

...

• 1.003 for a target roll of 20

On a roll with Advantage, Halfling Luck divides the chance to fail by :

• 400 for a target roll of 2
• 3.31 for a target roll of 3
• 1.95 for a target roll of 4

...

• 1.01 for a target roll of 20

On a roll with Disadvantage, Halfling Luck divides the chance to fail by :

• 19.52 for a target roll of 2
• 1.78 for a target roll of 3
• 1.36 for a target roll of 4

...

• 1.0003 for a target roll of 20

External Links

• Advantage and Halfling luck calculation by Kalaeman