Cremlevian War The Cremlevian War was a Yuuzhan Vong intra – species war . Fought between a domain led by Warmaster Yo ' gand and another domain led by Warmaster Steng , the war saw the destruction of much of the Yuuzhan Vong ' s home galaxy . Yo ' gand ' s domain eventually proved victorious after the Battle of Ygziir around 15 , 000 BBY . However , the war left the galaxy in ruins , and the warlike Yuuzhan Vong were stripped of the ability to use the Force by the living planet Yuuzhan ' tar . The Yuuzhan Vong eventually abandoned their damaged galaxy , searching the Intergalactic Void for a new home . History . The Cremlevian War began in the wake of an invasion by a droid species 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 . At some point , the two most powerful tribes — one led by Warmaster Yo ' 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 . Aftermath . 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 living homeworld 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 worshipping 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 . Behind the scenes . The Cremlevian War was first mentioned in " " , the opening book of " " series . It was later mentioned in " " , " " , and several reference guides that revealed more information about the ancient war . It was also given an entry in " The Complete Star Wars Encyclopedia " . As stated by author Daniel Wallace on his blog , " The New Essential Guide to Droids " implies that the Silentium and the Abominor were the droid species responsible for invading the Yuuzhan Vong , and threatening to wipe them out . However , this has not been confirmed by an official source , and thus remains mere speculation .