Like the Vex or Cabal invading Earth and you have to defend against their attack for x amount of time.
Edit: wow this thread is tending now? Amazing! Hopefully Bungie reads it!
English
#Destiny
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That farming spot people love/hate/could care less has that full scale war between hive/fallen now and then, occasionally one HUGE vex should spawn with an army of lesser vex and treat it as a real public event in which you have to kill that huge vex in the middle of the 3 way war! This would be amazing