Imposer

The Imposers were a series of ancient Forerunner robots, created initially by for the defense of  and cities, but later captured and repurposed by the Forerunners for expedition and assault on the. Imposers possessed formidable offensive abilities, but were regarded as too cumbersome ultimately for battle during the. Only 54 Imposers were ever produced, and most were destroyed by the from high orbit or outmaneuvered by the smaller but more agile. Captured Imposers were then dismantled or disintegrated following the war, others kept in museums or sold for scrap. By the time of the Flood's return, however, eight were still listed as functional, and it was these that were chosen by the for the defense of the  and its  worlds.