Genosian brain worms (controllable zombies) If u cant see the ship the death troopers are on, how are you gonna destroy it? I do get it about the flood and the halos however a MAD (mutually assured destruction) is a NO WIN scenario in which neither party survive. All SW cruisers from hundreds of thousands of star systems (1000s under mandalorian control alone) from ALL time = a few billions of ships as well. Its not a clear win either way; which is why im thinking it would come down to intel organized movement and movement speeds and in all 3 SW wins (Instant intel over any distance through a comms chain that can span 26-72 parsecs) (Some of the best intergalactic battle tacticians ever who have hand CONSISTENT experience in planetary and system on system warfare) (Hyperspace; time doesnt pass in the universe vs the time you experience in hyperspace: as far as the galaxy is concerned shortly after you enter hyperspace you arrive at destination---> no matter how long you the traveller spend in hyperspace)

Mutually assured distruction. No no no no forerunners shield worlds can house many ppl and ships protecting the from the array. Oh -blam!- I forgot about the two arks. It would end up like this forerunner human flood anx precursor fleet fights it out if win yay if loose 12 halo rings activate ppl in shield world walk out mop up win.

Star wars has planetary scale shield generation systems too guy; And Galaxy Gun as well as a dozen other super weapons that can take out entire star systems

Shield worlds are hollow metal planets which stops the halo from killing them by being ahead if time. These worlds when activated literaly stops existing in this realm so the ring has no effect.

Lol pointless internet fights.