Nightfall: The Arms Dealer
Prism: Attacks matching the focused element deal increased damage. All other elemental damage is reduced. Kinetic and incoming damage is unaffected. The focused element rotates periodically.
Killing Time: Defeat enemies to extend the mission timer, up to a limit.
Speed Of Dark
Complete the Nightfall with at least 5 minutes remaining.
Complete the Nightfall with fewer than 3 deaths.
Trash The Thresher
Shoot down a Thresher while fighting Bracus Zahn.