Lifegiver (Fallout)

Livegiver or Life Giver is a perk in Fallout, Fallout 2 and Fallout Tactics.

Effects
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.

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.)