Make more than one exotic weapon and armor pieces possible. However, not to be used in crucible or Gambit or Vanguard, for those modes should be one exotic piece of armor and weapon.
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So exactly what modes would you use them in. I actually think just having the ability to have option to have a limit to them in PVP(Gambit hardly counts) but in PVE it could be balanced differently and allow for more build variety.