Granite slug

Granite slugs were a type of slug found on the planet Coruscant. During the Clone Wars, the Senate Rotunda Preservation Committee, a committee within the Galactic Republic's Galactic Senate, were responsible for exterminating granite slugs and keeping the Senate Rotunda in the Senate Building architecturally sound.

Behind the scenes
Granite slugs were first mentioned in the new Star Wars canon in Rise of the Separatists, a 2019 supplement to Fantasy Flight Games' series of Star Wars roleplaying products. Brill was original created for the Star Wars Legends continuity, where the character was first mentioned in the 1994 novel Jedi Search, which was written by Kevin J. Anderson.