Prometheans are the result of an experiment by the Forerunners to stuff the brains of a human up the ass into the armour of a hunter that trys to hug Chuck Norris in Halo 4. Seriously, did the Forerunner get so pissed at Master Chief tearing off Sentinel Quadlazers that they started attacking? There are eight varieties of Promethean, which is so close yet so far for a 7 reference. They are very varied in type, but they all have one thing in common; They seriously mess you up on Legendary.