The Zillo Beast was a giant creature that existed on the planet Malastare in the Star Wars universe. It was first introduced in season 2, episode 18 of the Star Wars: The Clone Wars TV series. The Zillo Beast was a reptilian creature that had armored skin that was almost impervious to blasters, making it one of the toughest creatures in the galaxy.
The Zillo Beast was first discovered by the Republic during The Clone Wars when they attempted to invade Malastare to gain control of their fuel resources. The Zillo Beast was woken from hibernation by the Republic's attacks and went on a rampage, destroying everything in its path. Eventually, the Jedi managed to knock it out and take it back to Coruscant for study.
While studying the Zillo Beast, it was discovered that its skin could be used to create shields that were invulnerable to blasters. Chancellor Palpatine ordered the scientists to experiment on the creature to study its defenses and create a more effective shield for the Republic. This angered the Jedi and caused a moral dilemma for them.
The Zillo Beast managed to break free from the laboratory and went on another rampage in Coruscant. It was eventually killed by Anakin Skywalker using a technique he learned from the Son during his journey through Mortis.
The Zillo Beast is an interesting creature in the Star Wars universe because it represented the conflict between science and morality. It also showed the power of the Jedi and how they were able to deal with such a creature.