History of 21% Delirium

Overview

21% Delirium is a Legendary Arc Machine Gun with the 900 RPM Rapid-Fire Frame, in the Power slot using Heavy ammo. It is an add-clear ace and ranks as the second-best Arc machine gun after Song of Ir Yut. Its notable perks are Overflow, which loads the weapon beyond normal capacity on Special or Heavy ammo pickup (about 230 rounds with Backup Mag), and Killing Tally, a stacking damage boost. A recommended PvE roll is Fluted Barrel, Extended Mag, Reconstruction and Killing Tally; a curated roll is Polygonal Rifling, Extended Mag, Overflow and Killing Tally.

Acquisition

Originally earned in Gambit via the "By Your Bootstraps" quest. It is no longer available that way. It was unsunset in The Final Shape and is sold from the Legacy Gear section of the Exotic Archive in the Tower for 75,000 Glimmer. Some listings also place it at the Monument to Lost Lights. It cannot be reacquired from Collections.