During the years the forerunners existed, Artifact 117,one of the various sheild worlds, housed many unique species. One species in particular, was the warrior. The warrior was a advanced forerunner A.I with a class 12 combat skin designed to defend Artifact 117. Their original design was to destroy the flood, but since the Retriever, The leader of the warriors, took over, they were ordered to destroy flood, the covenant, and humans.
UNSC scientists haven't been able to get any close looks at these cyborgs, but most Spartans have seen warriors with a red eye commanding others. Warriors with a yellow tend to carry heavy weapons meaning they are heavy weapons specialists. Warriors with a blue eye are considered as a normal warrior.
Warriors rarely tend to charge at its enemy, instead, the shoot them from distances. Most warrior commanders tend to charge at its enemy.