Duel on Dica A duel took place on the acidic planet Dica between the Confederate General Grievous and Dark Jedi twins Kaa and Lii . When one of the twins stole Grievous ' s Sith lightsaber collection , the General followed her and confronted her and the other sister on Dica . A duel ensued , during which Grievous , who was using his only remaining lightsaber , struck the stolen lightsabers out of the Dark Jedi hands , accidentally causing the weapons to land on an acidic lake , destroying them . After the Dark Jedi twins quickly withdrew from the duel and fled with their lives , Grievous left the planet , resolving to start gathering Jedi lightsabers to replace the destroyed collection . Prelude . In hopes of becoming Sith , two Dark Jedi twin sisters , Kaa and Lii , decided to steal the Sith lightsaber collection of the Confederate General Grievous . After one of the twins discovered the location of Grievous and his collection , which consisted of four Sith lightsabers , she successfully entered Grievous ' s spacecraft and partially convinced the General that she was on his side . Even though the Dark Jedi raised Grievous ' s suspicions , she was able to steal the lightsaber collection and escape from the ship , after which she headed to the acidic planet Dica . However , the theft was quickly revealed , and Grievous pursued the Dark Jedi on Dica with his personal starfighter . The duel . After landing on Dica , the General quickly spotted Kaa standing on a cliff over an acidic lake . When Grievous confronted her , Lii revealed herself , and the Dark Jedi duo raised the stolen Sith lightsabers . Though slightly surprised , Grievous remained confident that he would defeat his enemies in combat . Armed with his sole remaining lightsaber , the General leaped onto the cliff . Grievous first grabbed both of Kaa ' s lightsabers with one of his cybernetic hands , and when Lii tried to attack him from behind , he grabbed her sabers with his other hand , locking the twins in their positions . However , the twins quickly broke free from the lock and severed a part of Grievous ' s mask with a swift combined swing . Grievous jumped down from the cliff , attaching himself just below it with his legs , and declared that tricks would not save the Dark Jedi from death . He jumped back on the cliff and disarmed the twins with one swipe of his saber . Aftermath . Much to the chagrin of the three combatants , the Sith lightsabers fell off from the cliff , right into the acidic lake , where they quickly disintegrated . With his Sith lightsabers now destroyed , Grievous was outraged , and the now - weaponless sisters chose to flee with their lives . As he prepared to leave the planet , Grievous resolved that he would have to restart his collection of lightsabers , only this time with Jedi lightsabers . Behind the scenes . The duel first appeared in " Dark Jedi " , a short comic story that was included in Tokyopop ' s " " anthology . The original 2006 publication of the work was labeled as " Infinities , " marking the stories contained within as non - canon . However , comments made by Leland Chee , keeper of Lucasfilm ' s Holocron continuity database , on StarWars . com later described the continuity of these stories as " a bit fuzzy , " indicating their canonicity was ambiguous . In 2008 , a French publication of the comic again labeled the stories as Infinities , thus securing their current status as non - canon tales .