Removing Rampage from Breakneck makes it half the gun it was and ruins the whole point of it. Give Rampage back to Breakneck.
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Honestly, it doesn't even need rampage. Sure, it would make it better in some ways, but Bungie removed the damage penalty that onslaught used to give, so rampage isn't really even necessary anymore. Plus, subsistence is fricking great with onslaught.