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Vedra-Prah was a Vulcan mental discipline designed to develop and practice the creation of mental shields to prevent psionic intrusions into their minds. In 2270, a time displaced Zar met his biological father Spock with the latter impressed by his sons natural mental shields as well as believed that the Vedra-Prah discipline would further aid his psionic talents. (TOS - The Yesterday Saga novel: Yesterday's Son)