You read the title.
No limits, there are as many Guardians as Destiny lore will allow.
Yes, Mass Effect gets the Reapers ( ͡o ͜ʖ ͡o)
Vote- Who wins?
All combat is set in a 2D- Vex World with infinite expanses (gotta make room for those reapers), due to the fact we have seen no space combat as of yet in Destiny, meaning there is no gauge as to how Guardians will perform in fleet combat (though it is safe to say they would probably be destroyed, based on my assumptions).
Who do you say wins?
Edit: In case it wasn't clear: this is Guardians, Fallen, Hive, Vex, Cabal, Awoken, etc vs Shepard and crew, alliance, reapers, etc.
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Well, us guardians have space magic. And their shields don't block energy.