The last Rite of the Nine weapon in the Prophecy dungeon that you should be chasing is A Sudden Death, especially if you’re running melee-focused builds that benefit from perks like One-Two Punch and Trench Barrel.
A Sudden Death is a 55 RPM shotgun from the Prophecy dungeon, which is still Void in the Rite of the Nine event. The perk pool remained mainly the same, but a couple of shifts, including One-Two Punch now in the third column, made it much stronger than its older version.
