The Tizo'pil Yun'tchilat or the The Day of Comprehending the Will of the Gods was the Yuuzhan Vong ceremony where one dhuryam was chosen to be the World Brain. First, the thirteen dhuryams' telepathic contact with their slaves was disrupted by the Shreeyam'tiz in order to prevent last minute sabotage. Then, the Shapers inspected the domains of each dhuryam in order to determine which was the most worthy. That dhuryam became the World Brain, assuming direct control over Yuuzhan'tar and managing the thousands of biological processes, and the supervising the Vongforming and maintenance of Yuuzhan'tar. The remaining dhuryams were destroyed.