Battle of Malastare / Legends The Battle of Malastare , one of the longest and fiercest engagements of the Clone Wars , took place in 22 BBY on the planet Malastare . Hostilities commenced when an invasion force of the Confederacy of Independent Systems assaulted the Mid Rim world , which had fuel reservoirs necessary for the Galactic Republic to maintain its offensive . After an extended period of fighting , the battle appeared to conclude with a Separatist victory , so Republic Supreme Chancellor Palpatine authorized the use of an untested superweapon , the electro - proton bomb , which was capable of deactivating technology by means of an electromagnetic pulse . As the Republic forces and Malastare ' s native Dug units occupied a final position near Doge Nakha Urus ' palace , a flight of bombers dropped the electro - proton bomb on the advancing Confederate droid columns . The weapon successfully deactivated the enemy army , but it also created a sinkhole , which swallowed Republic men and equipment . Rescuers led by Jedi Master Mace Windu discovered that a gargantuan creature — the Zillo Beast — had been awoken by the blast . Although the Dugs attempted to kill the beast , fearing that it would destroy their civilization , Palpatine desired to save the monster for possible experimenting , as its armor could not be penetrated by lightsabers or blasters . Eventually , a force of stun tanks subdued the beast , which was then taken to the Republic capital world of Coruscant for study , and a treaty was signed with the Dugs , providing the Grand Army of the Republic with fuel . Prelude . In 22 BBY , the first year of the Clone Wars , the rich natural fuel reserves of the Mid Rim planet Malastare became crucial for the Galactic Republic , whose war effort would have suffered a severe setback without them . Therefore , Palpatine , the Supreme Chancellor of the Republic — who was secretly a Sith Lord called Darth Sidious — intended to secure the world . This made the planet a strategic target , as the Confederacy of Independent Systems was also interested in these natural resources . To ensure the fuel supply of the Grand Army of the Republic and prevent Malastare from joining the Separatists , Palpatine wished to sign a treaty with the Malastarian council . The Dugs ' leader , Doge Nakha Urus , headed this body , and , therefore , he and the council had control of the fuel reserves . The battle . Beginning battle . After an extended period of combat , the Confederacy ' s droid units were on the verge of capturing Malastare . In an attempt to turn the tide of the battle , Palpatine authorized the Republic Army to utilize a new superweapon called the electro - proton bomb , which could release an electromagnetic wave capable of disabling droids and vehicles within its explosive radius . The weapon had never been tested before , and Nakha Urus and Jedi Master Mace Windu initially feared the possibility of the weapon affecting Malastare ' s ecosystem . The pair eventually agreed to the deployment of the bomb at the urging of the Chancellor . Doctor Sionver Boll , the female scientist who developed the bomb , also assured the two that the weapon would impact neither the world nor its inhabitants negatively . Meanwhile , a T - series tactical droid led the Confederacy ' s invasion force — consisting of B1 battle droids and B2 super battle droids supported by LR - 57 combat droids , Armored Assault Tanks , LM - 432 crab droids , " Vulture " - class droid starfighters , and " Hyena " - class bombers — toward the Doge ' s Palace , where Windu , Urus , Boll , and Jedi Knight Anakin Skywalker were gathering . As clone troopers , led by Commander CC - 6454 and Captain CT - 7567 , and supported by All Terrain Tactical Enforcers supplemented with Dug forces that included cavaliers riding insectomorphs and artillery , went on the defensive , several Y - wing bombers and ARC - 170 starfighters escorted by V - 19 Torrent starfighters took off from the Doge ' s palace under orders from Skywalker . While the ARCs began strafing the Confederate army , the bomber carrying the superweapon — piloted by clone pilot " Goji , " the leader of Red Squadron — maneuvered over the target area and dropped its load . The ensuing explosion and electromagnetic pulse damaged and deactivated the droid army , along with several Republic vehicles and pieces of technology . Zillo Beast . The detonation of the bomb caused parts of the surface to collapse , creating a sinkhole . Several clone troopers , AT - TEs , and LAAT gunships fell into the pit , which also damaged pipes coming from a fuel facility . The Jedi dispatched search parties to retrieve the men , but contact was soon lost with them , so Urus , Windu , and Skywalker traveled to the hole in a gunship to investigate . Windu assigned Skywalker to Urus , while he and CC - 0411 flew down the crater with a group of clone troopers . After finding some survivors , the Jedi Master continued his search with three clones , also calling Skywalker to the spot . When the surface they were standing on began to move , the team members realized they were standing atop a creature . The clones opened fire on the creature to no avail , as their blasters could not pierce the beast ' s skin . The clones fell off the beast , which killed one trooper , but Skywalker arrived in his starfighter and began circling around the monster ' s head to distract it . Windu and his escort were airlifted by an arriving LAAT / i gunship , but Skywalker ' s fighter was damaged by the creature , causing the vehicle to crash . The Jedi Knight attempted to engage the beast , only to find that its skin was lightsaber - resistant . Skywalker was forced to jump on R2 - D2 , his astromech droid , who used his thruster jets to flee the scene . Urus later informed the Jedi that the creature was none other than the last surviving Zillo Beast — a ninety - seven - meter - long monster that used to prey on the ancestors of the Dugs before its species was supposedly driven into extinction when the harvest of the fuel began . Soon , Dug rail gun s and debris loaders arrived and spent the rest of the day bombarding the beast , illuminating the sinkhole . The two Jedi quarreled with Urus on the matter , as the latter intended to kill the creature due to the danger it presented to the Dugs , as a prophecy said that one of the creatures would eventually eradicate the Dug species . The Jedi stated that ending the life of the last member of a sentient species was against the Jedi Code , but the Dug leader did not allow interference into the subject , dubbing it an internal affair and threatening to reject the fuel reserve treaty if he was not allowed to kill the Zillo Beast with Republic support . This meant that he was using his position to enforce the Republic to accept it . Seeing that there was no hope in convincing the Doge , Windu and Skywalker left . The Jedi then contacted Chancellor Palpatine , showing him a holorecording of the creature . Windu insisted that the beast be carried off - planet and settled in the Outer Rim Territories , while Boll suggested further study of the monster due to the ability of its skin to resist most weaponry . Skywalker then proposed that the gaps in its armor be targeted with stun cannons , which would put the animal into an unconscious state similar to death . This would allow the Republic to transport the beast away and examine it and satisfy the Dugs as well . The Chancellor , amazed by the monster , accepted Skywalker ' s plan . Upon approaching Urus with stun tanks , the Jedi found that the Dugs had already begun their operation ; the sinkhole was being filled up with Malastarian fuel , which was said to be lethal to the creature . Windu attempted to convince Urus by threatening him with his lightsaber , but the Zillo Beast climbed out of the sinkhole , destroying the Dug rail guns set up around the perimeter . Seeing this turn of events , the stun tanks opened fire and eventually managed to daze the beast , albeit at the cost of several tanks . Aftermath . Although the victory was costly , and the battle was one of the longest and fiercest engagements of the Clone Wars , Urus was satisfied and signed the treaty , which provided the Republic war machine with fuel necessary to continue its offensive . The unconscious beast was loaded onto transports after being airlifted by a flight of LAAT / c gunships , but Palpatine and his scientific advisors altered the original plans — which would have had the monster transported to the Outer Rim Territories — and ordered the Zillo Beast transported to Coruscant , the Republic ' s capital city - planet , so that its armor could be studied for possible use . The Chancellor tasked Windu and Skywalker with escorting the creature to Coruscant . Studies of the Zillo Beast on Coruscant found that its scales could not be removed without hurting or killing the creature . An angered Palpatine ordered Boll to kill it , but the beast broke free from the facility in which it was analyzed and wrought havoc on the planet . As the beast made its way to the Senate Building , Palpatine , Skywalker , Senator Padmé Amidala , and R2 - D2 attempted to flee on the Chancellor ' s shuttle . Their efforts to escape were foiled , however , when the Zillo Beast grabbed the shuttle and attempted to kill the Chancellor , as it recognized him as a Sith Lord . Skywalker , however , managed to cut the ship in two , thus allowing them to escape . Not long after , LAAT / i gunships arrived , which dropped Malastarian fuel bombs on the creature , killing it . As the lifeless body of the Zillo Beast was transported away , the Chancellor ordered Boll to clone the creature — a command that surprised her . The Confederacy also took notice of the Zillo Beast ' s destructive capabilities . Later in the war , the Confederacy covertly dispatched a number of heavily - cloaked commando droid shuttles to Malastare , hoping to gather a sample of the Zillo Beast ' s DNA so that Confederate technicians could clone another and use it as a war beast . Most of the Confederate forces , however , were destroyed by a tribe of uncivilized Dugs , who honored the Zillo Beast as a deity and used the droid parts to build a large statue in the shape of the beast . After detecting the presence of Confederate battle droids on Malastare , the Republic dispatched Skywalker ' s Padawan , Ahsoka Tano , and Master Plo Koon , along with a squad of clone troopers , to investigate . They found the scrap statue and were forced to fight both the Dugs and the remaining Confederate forces , defeating both . Behind the scenes . The battle made its debut in the eighteenth episode of the of the , titled " The Zillo Beast . " It eventually received its official name in the next episode , " The Zillo Beast Strikes Back , " and also made a non - canon ical appearance in the video game " " , serving as the game ' s epilogue . In " LEGO Star Wars " , the level depicting the Battle of Malastare is divided into two parts . The first part is one of the game ' s several real - time strategy levels , in which the Republic and the Confederacy battle on the surface . Both sides control a number of ground bases , which allow the controlling side to build defensive weapon emplacements and troop barracks and to call vehicle reinforcements . The playable characters Windu , Skywalker , CC - 0411 , and CT - 7567 are required to capture one of the enemy bases , which allows the Republic to build a targeting paddle for the electro - proton bomb . The second part of the level is the battle against the Zillo Beast . In order to unlock the option to call in RX - 200 tanks , several ground cannons must be built first . After the player has deployed several tanks on the battlefield and has concentrated their fire on the Zillo Beast , the creature is knocked down . It tries to attack again but is calmed with a giant pacifier . The Zillo Beast is then carried away by an LAAT gunship , while another gunship carries a giant rattle , and clone troopers follow behind with an equally giant baby bottle .