[quote]I think Destiny would win unless the Precursors show up or the Halo Rings are activated. If the Precursors show up then all is lost. As for the Flood. If one Spartan can handle the amount of Flood that Chief handled then what do you think an entire tower full of Guardians would do?[/quote]
The Flood and Forerunners have feats beyond the Vex and Hive.
Forerunners:
A fraction of their industrial capacity allowed them to build a Death Star worth of material every 5 minutes.
Can warp time and space on a galactic scale
Have energy generation to allow civilian equipment to destroy worlds.
Etc.
(Source)
https://forums.spacebattles.com/threads/forerunner-feat-thread.236388/
Flood:
A rate of expansion that allows them to take over Earth in hours. Also, it only took the Flood 4 to 10 years to take over 2/3 of the Galaxy. The Forerunners alone had 3,000,000 worlds (2054.8 worlds a day or 822 worlds a day, this ignores the other worlds in the Galaxy and the Floods exponential growth).
The Star Rods, which can crush planets into black holes.
The Logic plague, which drives AIs insane with information overload.
The Key Minds, which infect and warp reality.
Etc.
(Source)
https://forums.spacebattles.com/threads/precursor-flood-source-thread.264267/
The only reason Master Chief survived was because.
1 he was the best in the UNSC with the best AI in the UNSC, not to mention his canonical luck.
2 he only ever faced the Flood in their weakest state, but every time the flood are encountered it quickly escalates to needing the entire region to be glassed/nuked.
English
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Mother of explanation