Energy Resistance

Energy Resistance is a derived statistic in Fallout: New Vegas, Fallout 4, and Fallout 76 that allows a character to resist damage from Energy Weapons.

Fallout: New Vegas
With 100 Survival, and the helmet mentioned below, the 85% damage reduction cap can be achieved.

Temporarily increasing Energy Resistance

 * Atomic cocktail: +25 Energy Resistance for 2 min.
 * Marked beast helmet: +10 Energy Resistance, +2 Energy Weapons while worn.

Permanently increasing Energy Resistance

 * Refractor perk grants +10 Energy Resistance per level, up to a maximum of +50.
 * Shield Harmonics perk grants +20 Energy Resistance.

Temporarily increasing Energy Resistance

 * Radscorpion steak: +25 Energy Resistance for 60 minutes.
 * Radstag stew: +30 Energy Resistance for 60 minutes.
 * Various pieces of armor provide Energy Resistance.