Now for my actual argument "The Precursors were a race of beings preceding and possibly mythologized by the Forerunners, who believed them to be theoretical "Transsentient" beings, having the ability to travel among galaxies and accelerate the evolution of intelligent life. The Precursors achieved a higher level technological advancement than the Forerunners, being Tier-0, or Transsentience on the Forerunners' Technological Achievement Tiers.[1]" The Forunners could brainwash other species to fight for them (The prometheans), create planets (The shield worlds), make devastating biological weapons (the flood), and a way to destroy every living thing in the galaxy (The halo rings). If the Precusors were more powerful than the Forunners think about how ungodly powerful they were. I doubt superman could stand a chance against them.