Berserk is a companion perk in Fallout 4.
Obtaining
To gain the perk, the Sole Survivor has to reach maximum affinity with Strong. For ways to raise his affinity, see Strong's range of interests.
Effects
The player character deals +20% Melee Damage if the number of Hit Points is below 25% of the original value.
Notes
Despite the perk image depicting the use of a ranged weapon, only melee weapons are affected by this perk.