Do this one.
That's it. That's the post.
Okay, fine.. Any Kinetic pulse rifle. Le Monarque. A good arc rocket launcher. That's genuinely all you need. I know Le Monarque can be a task if you don't already have it but you need to just get it. Obviously "unstoppable pulse" and "overload bow" are what you want for modifiers.
This is the lost sector to grind. You will finish, on average, in about five and a half minutes and that's if you're being cautious and slow. If you're amazingly awesomely elite and everyone's a n00b compared to you... Firstly, dear lord just shut up. Secondly, you'll finish faster.
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I'm glad this got enough attention to direct players into trying the Lost Sector and that it helped as many as it did, it seems. Just a final bump. I know it's gone, or...well, on its Master variant, but hopefully this will catch a couple more and they'll know to keep an eye out for when this Legend Lost Sector comes around again. Or to even give the Master one a go. I might after work just to see how badly I get my @$$ handed to me then. Haha! Happy hunting.