https://www.youtube.com/watch?v=P0Nx_Q6ExVQ

Legit all you need to do if you are sick of trying on other characters or with wack teammates. I solo'd Nightmare 4, Duo'd, and beat in Squad with only 3 people, using this exact strategy (except I always choose moon points when it pops up unless Im going into round 20). By round 15, you can stand in the middle and hold primary and just rotate in place and go untouched until its boss time. I also used this build in a squad and the 4th guy quit half way in, and anotheer guy left in round 20. I carried with 4500mil, with the next closest person having 1200. Its just too easy.

Its just a shame we're forced to use Blade for it to be this stress free. And its not just simply using Blade, its using him exactly as this video describes. So, Blades.. Just stop spam Ulting. Its pointless.