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Faithful Protector increases Rex's attack damage by 25.
There are three options for retrieving the brain needed to unlock this perk:
- Just walk in and kill Rey. This option turns Old Lady Gibson and her other dogs hostile if the player character is not hidden while doing so.
- Talking to Old Lady Gibson will reveal an option to give her money, in which she will take Rey off to the side and kill him in private; giving you the brain afterwards.
- Alternatively, you may pass a Barter check of 70, in which case she will do this for free.