"The ancient texts are unclear. It appears we were invaded by a race that was more technological than animate. We called on the gods for protection, and they came to our aid, providing us with the knowledge we needed to convert our living resources to weapons. We defeated the threat, and, empowered by our victory, we gradually became conquerors of other species and civilizations."
The Cremlevian War began in the wake of an invasion by a droidspecies in the Yuuzhan Vong's galaxy. Threatened by extinction, the Yuuzhan Vong developed new weapons and technology, eventually defeating their droid enemies. After this victory, the Yuuzhan Vong continued waging war on other species in the galaxy, conquering a number of worlds. However, the species also began warring amongst itself.[2][3][4]
At some point, the two most powerful tribes—one led by WarmasterYo'gand and another led by Warmaster Steng—clashed. The resulting conflict known as the Cremlevian War saw the destruction of many planets. It came to a close around 15,000 BBY, when Yo'gand utilized a technique that was later named after him, to drop a moon on the planet Ygziir, which was allied with Steng. The tactic destroyed the planet, and killed many of the leaders of Steng's faction, who were stationed on Ygziir. Steng was also killed in the battle, bringing the war to an end.[1][2][3]
Yo'gand became the Yuuzhan Vong's first Supreme Overlord, and united the species. He was remembered as a hero for his actions, while the Battle of Ygziir was considered the proudest moment in Yuuzhan Vong history. However, the Cremlevian War left the Yuuzhan Vong's galaxy ruined. Many planets had been destroyed or greatly damaged in the struggle; the Yuuzhan Vong livinghomeworld of Yuuzhan'tar was one of the worlds that had suffered. The war had turned the Yuuzhan Vong to violence, and Yuuzhan'tar stripped the bloodthirsty species of their ability to touch the Force. The Yuuzhan Vong began worshiping pain and espousing a philosophy of violence and death to all who opposed them. After thousands of years of ferocity and destruction, the galaxy had been stripped of its resources, and was in ruin. The Yuuzhan Vong departed their galaxy to wander the Intergalactic Void. Eventually, they discovered a new galaxy, which they invaded in hope of conquering it.[2][3][5]