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The Serenity Class Drone is a miniscule cleaning robot created by the Luminoth, and currently the only robot that hasn't gone rogue due to the Ing invasion. They travel in swarms, cleaning the corridors of the Sanctuary Fortress as they go. Since they have virtually no combat potential, nor are they a food source, the drones are ignored by the Ing.
- Metroid Prime 2: Echoes (First appearance)