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In short, EOTN has many of the same mobs as Prophecies. So splitting up the areas and adding vanguard rep to kill charr in HM or Norn for shiverpeaks vanquishes would just diversify the game and simply put, make it better. And unlocking the skills would still need EoTN, which would make a good incentive for those who have prophecies but not EOTN to buy it if their ranks are getting high.

