Ychna Ychna were massive , bioengineered , space slug - like creatures that had mouths over eighty meters wide . Long enough to coil around an orbital city , ychna were used during the Yuuzhan Vong War by the sentient Yuuzhan Vong species to mainly assault space stations and other orbital structures . One ychna was deployed in 26 ABY over the planet Duro , where it practically ate the orbital city of Orr - Om . In the last year of the war , another was part of an attack on Caluula Station . Biology and appearance . Bioengineered by the sentient Yuuzhan Vong species , ychna were massive creatures that resembled space slugs . Ychna possessed a wedge - shaped head with a mouth over eighty meters in width and had a pouch over its blow hole that clung to its dorsal area , which Jedi Knight Mara Jade Skywalker suspected was for life support . The mouth of the ychna was incredibly powerful and could easily crush the metal used to construct space stations . Ychna also had a thick hide , allowing them to survive in the vacuum of space , and they had the capacity to suck out every bit of energy that a space station ' s deflector shield generator could produce . Ychna sometimes had to rely on gravity - manipulating dovin basal s to tow them into position in a vacuum . Despite the creature ' s immense size , a ychna could be killed if a proton torpedo was launched into its mouth . Behavior . Used to attack space stations and other orbital platforms , ychna would gorge on their mechanical targets and fatten themselves until they were bloated ; a ychna ' s hunger was hard to satisfy . They sometimes ripped parts off a station and ate the bits that they had separated from the superstructure . Ychna also occasionally went after enemy starships that flew near them and , while attacking space stations , liked to wrap around the orbital platforms to crush them . History . Bioengineered into existence by the year 25 ABY , ychna were used by the Yuuzhan Vong in their invasion of the galaxy controlled by the New Republic . The Yuuzhan Vong mainly utilized ychna to help destroy the New Republic ' s mechanical space stations . For the Yuuzhan Vong attack upon the planet Duro in 26 ABY , Warmaster Tsavong Lah used a ychna to destroy the orbital city of Orr - Om . Lah also threatened the defenders of Duro that the ychna would destroy them if the Yuuzhan Vong forces were attacked . However , Jedi Anakin Solo destroyed the ychna by firing a proton torpedo down the monster ' s throat with his X - wing starfighter , though the Yuuzhan Vong took the planet nonetheless . In the last year of the war , 29 ABY , a ychna was used in an attack on Caluula Station , which was orbiting the world of Caluula . The ychna took down the station ' s deflector shields before rending a hole in the station ' s exterior , which Yuuzhan Vong warriors used to board and overtake the facility . Behind the scenes . Ychna first appeared in " " , a 2000 novel from " " series , written by Kathy Tyers . It also later appeared in James Luceno ' s 2003 novel , " " , the final book in the series . Twice within " The Unifying Force " , ychna is misspelled as " yncha . " " The Complete Star Wars Encyclopedia " , released in 2008 , includes an entry for the ychna . The sentience of the ychna has yet to be revealed .