tizo'pil Yun'tchilat
known as the Day of Comprehending the Will of the Gods, the tizo'pil Yun'tchilat was one of the most important rituals of the Yuuzhan Vong who invaded the galaxy. It was during the tizo'pil Yun'tchilat that the dhuryams which had been grown aboard Ch'Gang Hool's seedship were to determine which was to be the World Brain to be installed on Coruscant. The dhuryams had been trained to use whatever resources were available to them to maintain a complex ecosystem in The Nursery, and the tizo'pil Yun'tchilat required them to use most of those same resources to defeat the other dhuryams. Only the last, surviving dhuryam would become the World Brain. To ensure that slaves were not used to artificially influence the tizo'pil Yun'tchilat, Yuuzhan Vong warriors protected the central hub of the Nursery. Other warriors used shreeyam'tiz to further interfere with the link between the dhuryams and the slave seeds placed in the bodies of their slaves. Ideally, the dhuryams would determine their own fate, with only one dhuryam surviving to become the World Brain. Any slaves that had remained alive were executed by the Yuuzhan Vong, and the seedship was broken into a large number of smaller seedships by the dhuryam, for more effective dispersal of biological material to the target planet. When the Yuuzhan Vong tried to seed Coruscant, they were unaware of the motives of Jacen Solo, who had been aboard the seedship at the insistance of Nom Anor, who was working with Vergere to turn Solo to the True Way. As the dhuryams grew, Jacen befriended one of them, establishing a mutually beneficial relationship that helped the dhuryam outperform its brethern. However, during the tizo'pil Yun'tchilat, Jacen's efforts would have destroyed all the dhuryams - the last genetic descendents of the original World Brain on Yuuzhan'tar - if Vergere had not stepped in. Vergere pleaded with Jacen to to kill his new friend, the one surviving dhuryam, and Jacen relented. The dhuryam was installed on Coruscant, now renamed Yuuzhan'tar, and began to reshape the planet in the image of the longlost homeworld. It retained a vestige of its relationship with Jacen, and later agreed to help him monitor the Yuuzhan Vong's progress on Coruscant.