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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, the Courier finds out that their brain, heart, and spine have been removed and replaced. This perk represents the replacement of their heart. While technically having these perks from the start of the add-on, they are unlocked in the course of the conversation.
Immunity to poisoning, adds a +25% bonus to healing items and -50% to Critical Chance for robots against you.
- Since the Cloud in the Sierra Madre is corrosive and not poisonous, it will still hurt the Courier even with this perk.
- Heartless shares the same Vault Boy image as Cardiac Arrest.
- Cazadores, usually being very lethal creatures, become significantly less threatening even in swarms due to their damage primarily relying on poison. This makes battles with the Legendary Cazador and the later encountered Specimen 73 much easier than normal.
Behind the scenesEdit
Heartless is an adjective associated with consistent cold, cruel behaviour from an individual. The term takes on a much more literal meaning in-game.
Both Cardiac arrest and Heartless do not affect healing from any items as they are missing the correct modifiers.