History of Choir of One

Choir of One is an Exotic Void Auto Rifle from the Echoes era (Season 24 per D2 Wiki).

Overview

Intrinsic Command Frame: extended-range, heavy-caliber projectiles at a reduced rate of fire, with bonus precision damage when aiming down sights. D2 Wiki also lists the exotic trait Fanatical Lance (rapid final blows make targets burst into radiolarian fluid; hip fire launches a spread), which other guides do not mention.

Acquisition

Complete the Encore Exotic Mission (Echoes Act 3, "Encore: Overture"). Talk to Failsafe after Acts 1 and 2 to start the quest "A Rising Chorus". First completion on any difficulty unlocks the weapon.

Catalyst

Three catalyst traits: Subsistence (kills partly reload the magazine), Destabilizing Rounds (final blows make nearby targets volatile) and Onslaught (final blows raise rate of fire). ExitLag says they come from Expert Encore runs; D2 Wiki says they come through weapon reshaping, so check in game.