Extermination units operated as pest controllers on the Outer Rim planet Elphrona during the High Republic Era. In 232 BBY, a claim on Elphrona experienced difficulties with a nest of chromants. Jedi Master Loden Greatstorm of Elphrona's Jedi outpost sought to help the claim instead of having them call for an extermination unit, though Jedi Knight Indeera Stokes questioned the necessity of his involvement. However, the Jedi ultimately did not help the claim with their chromant issue due to embarking on a rescue mission elsewhere on Elphrona.
Extermination units were mentioned in Light of the Jedi, a 2021 novel written by Charles Soule as part of the Star Wars: The High Republic multimedia project's Phase I.
Extermination units were mentioned in Light of the Jedi, a 2021 novel written by Charles Soule as part of the Star Wars: The High Republic multimedia project's Phase I.