“With each level of this Perk, you gain an additional 4 Hit Points every time you advance a level. This is in addition to the Hit Points you already gain per level based off of your Endurance.”— Fallout 2 In-game description
Every time the player character gains a level, they gain an additional four Hit Points for each rank of this perk. With two ranks of Lifegiver, that's +8 HP each level, which is more than 10 points in Endurance would give you.
Although it's not clear from the description, Lifegiver grants +4 HP for every level gained, including the level when the perk was taken. (Fallout Tactics does not give the HP on the level you take the perk.)
Fallout 3, Fallout: New Vegas[]
“With the Life Giver perk, you gain an additional 30 Hit Points.”— Fallout 3 description
This perk also gives the player character unique dialogue choices when speaking with some specific characters, like Tree Father Birch in Oasis.
Notes[]
In the data files, it is listed as being available in 3 ranks, and loading screens will mention multiple "levels" of the perk.
The corresponding image is a Vault Boy version of Jesus.
Bugs[]
Has platform::PCHas platform::Playstation 3Has platform::Xbox 360 In Fallout: New Vegas, the health that Lifegiver grants is excluded from the 50% calculation for Ferocious Loyalty. [已验证]
Fallout 4[]
“You embody wellness! You also receive an instant Health increase, which has no downsides (except it takes slightly longer to inflict Nerd Rage! on a set of foes). If you need extra Health, this is a must-take perk.”— Fallout 4 Vault Dweller's Survival Guide description
You instantly gain another +20 maximum Health, and slowly regenerate lost Health.
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This is best as an early-game perk. The math is such that, once one reaches Level 32, they would have been better off just putting 1 more point into Endurance than in getting a level in the Lifegiver perk. However, the benefits of +20 Health early game can be considerable.
The health regeneration gained from the third rank grants the player 0.5% health every second. However, health is not regenerated while in combat (i.e. when enemies are nearby.) The health regeneration is fast enough (out of combat) to be a real convenience.