One particular Zillo Beast was thought to be the final surviving member of its species. During the Battle of Malastare in 21 BBY, the Galactic Republic utilized an electro-proton bomb against the Confederacy of Independent Systems's battle droid army, which resulted in its awakening. After the creature went on a destructive rampage, obliterating numerous Dug tanks and Republic vehicles, a squadron of RX-200 Falchion-class assault tanks managed to stun it. The Republic then transported it to Coruscant, their capital world, for study by Doctor Sionver Boll. However, it escaped confinement and proceeded to wreak havoc on Coruscant, nearly killing Supreme Chancellor Palpatine in the process. Boll then received orders to investigate the zillo beast's hide with the goal of creating a synthetic version for use in clone trooper armor. Consequently, the Republic was compelled to eliminate the creature, but Palpatine instructed Doctor Boll to proceed with cloning it.