Takhaff Uul was a member of the priest caste of the Yuuzhan Vong. Uul was a High Priest of Yun-Yuuzhan, the Creator. After the Fall of Coruscant, Uul approached Warmaster Tsavong Lah. He said he had a dream in which Yun-Yuuzhan was angry for not receiving any of the glory from the invasion. Uul said the Creator wanted a whole world to be made into a temple for Yun-Yuuzhan. In truth, Takhaff Uul was conspiring with Master Shaper Ghithra Dal to control Lah. On the shaper vessel Fu'ulanh, Lah unleashed a group of rancors, killing Uul, Dal, and their co-conspirators.
- The New Jedi Order: Enemy Lines I: Rebel Dream (First appearance)
- The New Jedi Order: Enemy Lines II: Rebel Stand