T'sai was a Vulcan master who guided Vulcans who wished to undergo the rituals to attain kolinahr.

T'Sai became High Master of the Kolinahru in 2229 after T'Rea was stripped of the position. (TOS novelization: Star Trek V: The Final Frontier)

In 2271, T'sai accompanied Spock and Dr. Keridwen Llewellyn in pursuing Zakal. (TOS novel: The Lost Years)

In 2273, T'sai presented Spock with the symbol of pure logic after he underwent the kolinahr for 2.8 years. However, Spock refused the symbol after his Human half was touched by strong emotions emanating from the V'Ger entity. T'sai melded with Spock and told him that he had to look elsewhere to find the answers he sought. (TOS movie, novelization & comic adaptation: The Motion Picture)

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