Ender: 25 Dreadnought ships each with a "Little Doctor" Reapers: The entirety of all Reapers + ships Flood: Gravemind, with 25 Forerunner Dreadnoughts at full capacity Necromorphs: 2 Brother Moons with 20 starships (of your choice) Helghast: 30 Helghast Destroyers Darkness: 25 Follower's ships with 4 Champions Who wins? I say Ender because he incinerates each mini-fleet with one to three "Little Doctors".