Berserk

Berserk is a companion perk in Fallout 4.

Obtaining
To gain the perk, the Sole Survivor must reach maximum affinity with Strong. Due to his large range of dislikes (such as lockpicking, hacking, entering power armor and common courtesy in conversations) it can sometimes be hard to gain this perk, one steady way to get the perk is to keep doing the repeatable minutemen quests while avoiding picking locks, hacking and other quests, note that this is not a particularly fast way to gain the perk just a safe way to avoid gaining dislikes from Strong which could ultimately lead to losing him as a possible follower for good. It is possible to gain four quick likes in the conversation with Initiate Clarke at the end of the Brotherhood of Steel quest Duty or Dishonor

Effects
The player character deals +20% Melee Damage if the number of Hit Points is below 25% of the original value.