Is a 1998 sourcebook for the Star Trek: The Next Generation Roleplaying Game, published by Last Unicorn Games, offering deep dives into Vulcan culture, history, philosophy (especially Kolinahr), and society for TNG RPG players and GMs, expanding gameplay opportunities for adventures on or involving Vulcans and their homeworld. It's a key supplement for exploring the logical, emotional, and cultural nuances of the iconic species within the RPG system, featuring detailed lore and game mechanics.