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With the Lead Belly perk, you take 50% less radiation every time you drink from an irradiated water source.— In-game description

Lead Belly is a perk in Fallout 3, Fallout: New Vegas, Fallout 4, Fallout 76, Fallout: The Board Game and Fallout: The Roleplaying Game.

Fallout 3 and Fallout: New Vegas

Effects

With the Lead Belly perk, 50% less radiation is taken every time you drink from an irradiated water source. In Fallout: New Vegas, this benefit extends to all irradiated food and drink.

Notes

  • Because both games rely on the same engine as Oblivion, which used floating point numbers even if the player only saw rounded whole numbers, it is highly likely that a source of water that goes (for example) from "1 Rad" pre-perk to "1 Rad" post-perk is still accurately treated internally i.e. 1 Rad versus .5 Rad.
  • At high levels this perk may become redundant; RadAway, Rad-X, and apparel with radiation resistance, such as power armor, become more available and readily obtainable.
  • In Fallout: New Vegas, there is an abundance of clean water, reducing the relative usefulness of the perk, although the benefit is extended to all irradiated food and water.
  • With the addition of Implant Y-3 in Old World Blues, this perk potentially becomes redundant, though is still available much earlier and for free. This perk also works on food while the implant does not.

Fallout 4

Your digestive tract has adjusted to the weirdness of the Wasteland! Are you sick of stimpaks? Detest chemistry stations and making your own chess, or constantly scavenging for them? Then look for comestibles and water sources throughout the Commonwealth without the usual "distaste"! Take this perk or ones that help you when you use chems (like Chem Resistant or Chemist).Fallout 4 Vault Dweller's Survival Guide description

Effects

At levels 1 and 2 of this perk, the Radiation Resistance function, which works similarly to Damage Resistance, is applied to reduce the rads received from ingested food and drink. For example a Radiation resistance of 10 (Level 1 of this perk) will reduce the rads in an item that normally delivers 10 rads, by half, to 5 rads. A resistance of 20 (Level 2) will reduce the rads in an item that normally delivers 20 rads, by half, to 10 rads.

The third level of the perk simply eliminates any rads from any ingested item: no rads are shown in the PipBoy, not even "0 rads" is shown.

Rank Requirements Effects Description Form ID
1 END 2 10 Radiation Resistance is applied to reduce ingested rads. Your digestive tract has adjusted to the weirdness of the Wasteland! Take less radiation from eating or drinking. 0004A0B9
2 END 2, LVL 6 20 Radiation Resistance is applied to reduce ingested rads. You take even less radiation from eating or drinking. 00024B00
3 END 2, LVL 17 Immune to ingested rads. You take no radiation from eating or drinking. 00024B01

Notes

Taking this perk early on may help out a lot, particularly in a Survival mode game, as most available food (raw or pre-war) carries significant rads, and RadAway is scarce in the beginning of the game. Conversely, this perk has little value for high-level characters, particularly in a non-Survival game, because foods provide only a fixed amount of hit points (whereas stimpaks restore a percentage). However, in Survival mode, this perk is more useful due to the necessity of regularly eating and drinking to stay satiated and hydrated.

Bugs

Icon pc.png Icon xboxone.png Icon ps4.png The radiation resistance provided by the first two levels of this perk is added to the radiation resistance displayed in the Pip Boy. This is incorrect (and can be misleading), as this specific radiation resistance is only applied to ingested items, and has no effect in resisting environmental radiation or radiation from weapons. [verification overdue]

Fallout 76

Your digestive tract has adjusted to the weirdness of the Wasteland!

Effects

Rank Description Form ID
1 You take 30% less radiation from eating or drinking 0004A0B9
2 You take 60% less radiation from eating or drinking 00024B00
3 You no longer take radiation damage from eating or drinking 00024B01

Notes

  • Lead Belly does not prevent radiation damage when collecting dirty water from a river or a water pump.
  • A card is found in Vault 76 on checkpoint pop-up number 6, labeled "Get a Job."

Fallout: The Roleplaying Game

At rank 1, one may re-roll the DC to determine if radiation damage from irradiated food or drink.

At rank 2, become immune to radiation damage from consuming irradiated food or drink.

Each time you take this perk, the level requirement increases by 4.

Fallout: The Board Game

After being obtained, it can be discarded to set radiation to zero.

Gallery

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