Personally mine is [i]Overcharge[/i] . Kill two enemies at once with the fusion rifle , 20 times. It might be easy but it's still irritating as hell.
Edit: excluding exotic bounties. I know some of those are considered extremely tough.
Edit: everyone's suggesting the first moon mission seems like a good method for the overcharge issue. Thanks guys. That's my problem fixed anyway!
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Edited by Hazonkos: 9/17/2014 9:32:55 PMTe easiest way to get the fusion rifle kill is todo the first mission on the Moon to the point you open then temple use it on the thrall then die and repeat again since atleast 20 come busting out