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.