In Mass Effect, the Reapers are a mechanical race that destroys civilizations.
Tips
usage
者 is the literary suffix for "one who does X" (cf. 学者 scholar, 作者 author, 记者 reporter). 收割者 is more vivid and ominous than the plain 收割机 (harvester machine), pick it when you want the Grim-Reaper or sci-fi ring.
