I think a game mode similar to COD Zombies (survival) would be brilliant with rewards scaled to the level you manage to reach, you get you weapons through engrams that auto de-crypt and are removed at the end in place for the permanent reward
You would start with the weapon you take in or with a standard basic weapon. Could also feature its own leader board, bounties and weapons.
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Edited by jasperbarg: 9/17/2014 12:01:20 PMJust make it a round system where every (...) rounds the enemy difficulty increases. Leave the weapon system out, to difficult
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Edited by Pringle92: 9/17/2014 11:38:59 AMAlso have a easy and hard mode