Sionver Boll Sionver Boll was a female Bivall doctor who served the Galactic Republic during the Clone Wars . Biography . A scientist of the Bivall species , Sionver Boll designed and developed the electro - proton bomb , an explosive device that , when detonated , released an immense electromagnetic pulse . This was intended to shut down all droids , the mainstay of the armed forces of the Confederacy of Independent Systems . In 22 BBY , the first test of the device occurred during the Battle of Malastare , a conflict out of which the Republic also hoped to obtain exclusive rights to resources on the planet pending their victory . However , when the device detonated , it not only eliminated the entire Separatist force deployed against Republic troops and local Dugs , but also opened a sinkhole that swallowed combatants from both sides and awakened a gargantuan Zillo Beast , a species previously thought extinct . In the ensuing rampage , the forces of the Republic and their allies sustained heavy casualties . The armor of the creature proved impossible to penetrate , even by the potent blades of the Jedi present at the battle , which led Boll and Supreme Chancellor Palpatine to express interest in studying the beast for possible reproduction of its scales as near - indestructible armor for clone troopers and ships . The Dugs demanded that the creature be killed , but trickery and quick thinking on the part of Jedi Generals Anakin Skywalker and Mace Windu allowed them to escape with a living but sedated Zillo Beast . When the beast was brought to Coruscant to be studied , the Chancellor suggested that the beast be killed as the process of removing its scales for study might prove too painful for the beast to endure . Despite this apparent desire for mercy , Dr . Boll protested , stating that it was the last of its kind and that there was a chance the creature might be sentient . She also indicated a scowl on the creature ' s face as a response to the Chancellor ' s remarks , stating that it " didn ' t seem to like [ his ] comment . " Palpatine was not convinced by her words and bluntly informed her that , if she continued to refuse his order , she would be replaced with someone who would . He also suggested that a toxic gas similar to that used by the Dugs to kill other members of the species be synthesized by Doctor Boll in an attempt to halt the creature . Boll mournfully complied , but she and her staff did not produce enough of the toxin to kill the beast . The Zillo Beast , seemed to prove the doctor ' s earlier statement right , as it reacted to the toxin by escaping the confines of the research facility and embarking on a second rampage , with Palpatine as the primary target . Untold numbers of civilians and Coruscanti police forces perished as the creature , seemingly aware of the meaning behind the Chancellor ' s words and potentially even his nature as a servant of the dark side , destroyed every image of Palpatine it could find and marched steadily onward toward the Senate Building . Out of desperation , the Chancellor contacted Boll and ordered her to create more of the gas . Following the doctor ' s immediate compliance , the toxin was fired from Republic LAAT / i gunships at the Zillo Beast as it climbed the citadel of the Senate Building , killing the creature . Boll remained somewhat mournful over the fate of the creature and was startled when the Chancellor privately ordered her to clone it . However , before Boll had a chance to do so , the Clone Wars came to a close and the Emperor , following his self - coronation , had no need for her services and skills any longer . Personality and traits . Boll possessed great empathy for the Zillo Beast , consoling the beast prior to its anticipated execution . She was also not afraid to confront even the Chancellor of the Republic in regards to her beliefs and concerns regarding the beast and her experimentation on it , as well as responding to Palpatine with dry sarcasm when the Zillo Beast scowled at him to show its discontent . Behind the scenes . Sionver Boll was voiced by Cara Pifko , who also voiced Suu Lawquane .