Fallout Wiki
Fallout Wiki

Early testing was abruptly discontinued when, during the end of the first trial run, several test subjects were placed in a room together.

From the lead doctor's notes: "It was intense. You could feel something change in the room. The three of them looked at each other for a few seconds, and then all just started babbling simultaneously. It wasn't until later that we realized they'd somehow managed to develop an entirely new language inside of 20 minutes. Body language became increasingly agitated. They seemed upset, like they were trapped. When we sent men in to calm things down, they were overpowered in moments. If we hadn't had the failsafe systems in place..."

Later trial runs used a significantly distilled version of the serum, and test subjects were kept isolated for the duration of the experiments.
The Whitespring bunker terminal entries

Herd Mentality is a mutation in Fallout 76.


Positive effects
+2 to all SPECIAL stats when grouped.
Negative effects
-2 to all SPECIAL stats when solo.


  • The perk checks to see if a player is a member of a team and does not check for teammates. Therefore, the positive effect is applied even when alone on a public team.
  • Even though its description says "When your teammates are nearby ...", distance to one's teammates does not matter. It just matters whether you are in a group or not (verified with update Locked & Loaded).