The Star Forge, creates an endless armada from nothing. This one forge alone could out-pace the destruction and put the Halo-verse on the defensive. Death Stars, able to destroy planets with a single blast. Yuuzhan Vong, can terraform a planet to their liking overnight; along with create black holes to suck in enemy fleets. Also, gravity basins which are able to pull nearby planets/moons from orbit and crash into whichever it is placed on. Mass Shadow Generator, increase the gravity of an area so immensely that everything is crushed to bits. This includes destroying planets, ships, moons, etc. The Force, this varies, but some Force users were able to destroy entire quadrants. Darth Nihilus "fed" on life, and was able to kill billions just by focusing on their planets and it's life source. Sun Crusher, a small ship with maneuverability of fighter class ships capable of causing suns and stars to go supernova essentially wiping out solar systems. Mandalorians, they pretty much cancel out any Spartans. My point is, that if everything in the SW Universe worked together then HALO would lose; perhaps not by much but they would lose.