The Scarabs were used extensively in the Outer Rim worlds to subjugate worlds that opposed the Trade Federation. Their manufacturing facilities were hidden away on the remote volcanic world of Eos, which were discovered by mercenary Vana Sage by following a damaged Hunter-Seeker Droid. Vana had earlier participated in the testing of the Scarab Droids, shooting down several waves of the prototype fighters deployed from a Federation Landing Craft. After intercepting a transmission regarding a failed attack on the Queen's Starship, Vana was betrayed by her employers, who sent Hunter-Seeker Droids and hired guns to kill her before she could expose their dirty secret.