Why not have some new PvE modes take advantage of the large number of crucible maps?
Imagine taking a fireteam to go clear out First Light from fallen and hive when they decide to drop in a walker or two, it would work well with the strike scoring system and it could even utilize ideas from crucible like scoring into a rift to prevent a bomb or something from going off.
Its using assets that are already in the game and it could even be made competitive for those people who like fighting the darkness but also want some bragging rights.
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Players have been asking for monthly PvE content like PvP has with IB, this would be a great place to start!