Brainless

Brainless is a special perk $$

Obtaining
In the initial dialogue with Doctor Klein as part of the quest Welcome to the Big Empty, the Courier finds out that their brain, heart, and spine have been removed and replaced with advanced technologies. This perk represents the replacement of your brain. While you technically have these perks from the start of the add-on, they are unlocked in the course of the conversation.

Effects
The head is immune to crippling, +5% to DT (minimum 1) and a +25% resistance to chem addictions.