Forerunner did not seem the least bit moved by what she said, one way or the other. “I have made certain deductions… there is insufficient time to explain how. But based on information obtained from Lucky Break, Deadlight, and my own observations of Equestria, I believe that the Sanctuary system uses cutie marks as identifiers. They are not immutable, but they are intimately personal, and apparently impossible to imitate. However, young ponies do not yet possess cutie marks, and instead have them assigned in the course of puberty.”