The Tizo'pil Yun'tchilat, alternatively known as The Day of Comprehending the Will of the Gods, represented a significant ritual for the Yuuzhan Vong people. During this event, a single dhuryam was selected for the role of the World Brain. Initially, the Shreeyam'tiz interfered with the telepathic connections between the thirteen dhuryams and their enslaved populations. This action was taken to preclude any potential acts of sabotage occurring at the last moment. Subsequently, the shapers conducted examinations of each dhuryam's sphere of influence to ascertain which one possessed the greatest merit. The dhuryam deemed most deserving then ascended to the position of World Brain, gaining immediate command over Yuuzhan'tar. This involved overseeing countless biological functions, as well as directing the Vongforming and upkeep of Yuuzhan'tar. The dhuryams that were not chosen were eliminated.