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Fun fact: the reason why branding is an effective means of identifying magic users is because the tattoo applied to their faces uses a unique kind of ink that incorporates hydra venom. If the Branded attempts to remove the mark the venom is released into the bloodstream, killing the Branded. The only two people who can perform the procedure to remove brands without killing the patient are Tarja and her assistant if you complete a sidequest for him. This is why when Clive gets his brand removed and has that massive ass scar on his face nobody accuses him of being Branded, as the procedure for removing the brands is unknown