Your heart has been replaced with advanced technologies: You cannot be poisoned, and filters in your heart will also regulate bleeding and healing, allowing all healing items (chems) to function at a higher level. Robots are now confused by you and 50% less likely to score a critical hit.”— Fallout: New Vegas description
In the initial dialogue with Dr. Klein as part of the quest Welcome to the Big Empty, you find out that your brain, heart, and spine have been removed and replaced. This perk represents the replacement of your heart. While you technically have these perks from the start of the add-on, they are unlocked in the course of the conversation.
You cannot be poisoned, you gain +25% bonus to healing items and robots have -50% critical chance against you.
- Since the Cloud in the Sierra Madre is not poisonous but highly corrosive, it will still hurt the player even with this perk.
- Heartless shares the same Vault boy image as Cardiac Arrest.