The Zillo Beast was a large, non-sentient being found on the planet Malastare. Thousands of years before the Clone Wars, the beasts troubled the alien race known as the Dugs and took many Dug lives. That was until the Dugs started mining oil from the core. The oil turned out to be poisonous to the Zillo beasts and they were gradually killed off to the point that they were thought to be extinct. Doge Nakha Urus said that a prophecy stated that the Zillo Beasts would return someday which came true after the last of them was awakened by a Republic Electro-Proton bomb.