Void

Choir of One — Volatile Choir (Hunter)

Invis-loop ad-clear + Volatile chain primary-killer

✓ Manifest Void · Special · 225 RPM · No intrinsic champion

Weapon: Choir of One (Auto Rifle · Special · Void) · Subclass: Nightstalker (Void) · Role: Invis-loop ad-clear + Volatile chain primary-killer Sandbox: 9.7.0 · Created 2026-06-16

A Special-ammo Void auto rifle that hits like a primary: hip-fire a radiolarian spread into the pack, ADS for precision, and let the catalyst spray Volatile on every multikill. Gyrfalcon's bolts more Volatile onto it the instant you leave invis — and you leave invis constantly. The gun makes the volatile detonations, the detonations make the kills, the kills make the invis, the invis re-arms the gun. One Void weapon runs the whole engine.

The weapon

Command Frame (verbatim): Fires extended-range, heavy-caliber projectiles at a reduced rate of fire. Deals increased precision damage when aiming down sights.

Catalyst — Choir of One Catalyst: the catalyst's display text is blank in our manifest dump (`catalysts.md` line 28 has no description), but the weapon's catalyst socket exposes the actual plug it installs: Destabilizing Rounds Refit (also Subsistence Refit / Onslaught Refit are the alternate refit plugs in the same socket). Destabilizing Rounds = multikills make targets Volatile; volatile detonations spread to nearby enemies — Void's elemental clear trait, native to the gun once the catalyst is in.

What it does in the hand: it's a Void Special-ammo auto rifle (manifest: `defaultDamageType=4` Void, `ammoType=2` Special), 225 RPM, Range 73. Two firing modes off one trigger — ADS fires tight, high-precision-damage rounds (the Command Frame bonus); hip-fire (its hidden Fanatical Lance intrinsic) launches a slower spread of projectiles that detonate on impact, a shotgun-grade panic button at close range. Special ammo economy means it draws from your green-brick pool, so it slots where a fusion/shotgun would and frees the primary slot for something else.

Loadout

Slot	Pick	Why
Subclass	Nightstalker (Void)	The invis engine that re-arms Gyrfalcon every cycle.
Super	Shadowshot: Deadfall	Tether groups the pack + 35% weaken — pairs with Echo of Harvest (weakened kills → Orb + Void Breach) and gives the gun debuffed targets to mulch.
Class ability	Gambler's Dodge	Melee back near enemies; pairs with Vanishing Step to enter invis on demand → re-trigger Gyrfalcon.
Melee	Snare Bomb (Quickfall)	Smoke → invis + weaken; another Gyrfalcon re-arm and a Stylish trigger.
Grenade	Vortex Grenade	Lingering weaken (Undermining) + multikill fuel for Volatile; Remnants extends it.
Aspect 1	Stylish Executioner	Any elemental-debuffed kill → invis + Truesight. Volatile is an elemental debuff, so the gun's own detonations trigger this — invis on tap with no cooldown.
Aspect 2	Vanishing Step	Dodging makes you invisible (+2 aspect energy). The deliberate "emerge from invis" button that re-arms Gyrfalcon's Volatile Rounds whenever Stylish hasn't already fired.
Fragments	Undermining · Instability · Harvest · Starvation	See below — they make Volatile self-sustaining and convert it to survivability.
Exotic armour	Gyrfalcon's Hauberk (Chest)	Volatile Rounds on emerging from invis + finisher-in-invis weapon-damage/overshield burst.
Kinetic/Primary	A primary you like (Hatchling/Voltshot/etc.)	Choir eats the Special slot, so keep a real primary for sustained trash and the green-brick economy.
Heavy	Boss-DPS heavy (LMG / rocket / GL)	Choir + abilities own ad-clear and majors; heavy handles bosses/champions Choir can't stun.

Why this works (the mechanics)

Two independent Volatile sources keep it always on. The catalyst (Destabilizing Rounds Refit) makes multikills Volatile; Gyrfalcon's "See Me, Feel Me" grants Volatile Rounds every time you emerge from invisibility. You leave invis constantly (Stylish on every debuffed kill, Vanishing Step on every dodge), so the gun is dripping Volatile between catalyst procs and topped up to full-uptime Volatile Rounds the instant you re-appear.
Volatile is the keystone debuff — and the gun applies it to itself. A volatile detonation is "any elemental debuff," which is exactly what Stylish Executioner consumes. So: shoot pack → Volatile detonations kill → Stylish → invis + Truesight → emerge → Gyrfalcon re-arms Volatile → shoot pack. The loop closes on the weapon alone; abilities are accelerants, not prerequisites.
Special-ammo Void primary-killer is the niche. Command Frame's ADS precision bonus means it bodies majors like a heavy primary, while hip-fire Fanatical Lance is a point-blank deletion spread. Because it's Special ammo it sits in the energy slot and frees the kinetic slot for a true primary — you carry two ad-clear guns, not one, and Choir is the one that feeds the subclass.
The fragment package converts Volatile into the whole Void economy. Echo of Instability (grenade kills → Volatile Rounds) is a third Volatile source for when you've spent invis; Echo of Undermining (Void grenades weaken) + Deadfall's tether stack Weaken under the Volatile for a debuff-bucket multiplier the whole fireteam shares; Echo of Harvest turns every weakened kill into an Orb + Void Breach; Echo of Starvation turns that pickup into Devour. Shoot Void → Volatile + Weaken → kills → orbs/breaches → Devour heal → keep shooting.
Gyrfalcon's finisher burst is the boss/champion window. Finish a target while invisible and all weapons gain bonus damage plus a reserve overshield for you and allies (deployable on class ability). Truesight from Stylish makes finishing a weakened major trivial — that's your team-wide damage steroid before a DPS phase.

Stats & mods

Weapons 200 → Health/Class high → Super. Weapons is the obvious primary (it's a weapon build and the 9.7.0 stat adds PvE weapon damage vs minors/majors directly on top of Volatile + Weaken). Class feeds Gambler's/Vanishing Step uptime; Health is the DR floor under Devour + Gyrfalcon's reserve overshield. Push Super if you lean on Deadfall as the team debuff.

Fragment stat deltas (from `fragments.md`): Undermining −10 Grenade, Instability +10 Melee, Harvest neutral, Starvation −10 Class — net cheap, mostly Melee-positive.

Mods: Void Weapon Surge ×2 on boots (≈+17% to Choir's damage) · Harmonic/Void Siphon helmet (Void kills → Orbs, Choir makes these nonstop) · Special Ammo Finder / Scavenger so the Special-ammo gun never starves · Orbs of Restoration for ability energy on pickup · Reaper / Powerful Attraction on the class item to vacuum the orb flood Harvest produces. Resistance mods (Void/Arc/Solar Resist) on chest under the overshield/Devour layers.

Where it shines

Endgame ad-clear (GMs, −30/−40, Master content): Volatile chains + Weaken thin packs while invis + Devour + Gyrfalcon overshield carry survivability through four DR/heal layers. This is the build's home.
Team play: Deadfall's 35% weaken and Gyrfalcon's all-weapon damage burst + fireteam reserve overshield make it a debuff/buff battery, not just personal clear.
Champion coverage — flag it. Choir of One has no listed intrinsic champion stun in the manifest, and a Special-ammo auto rifle's archetype stun is not guaranteed under Anti-Champion 2.0 (Aggressive/High-Impact → Unstoppable; Precision/Adaptive → Barrier; Lightweight/Rapid-Fire → Overload — Choir's frame isn't one of the standard auto archetypes). Treat Choir as carrying NO champion stun. Cover champions with: Deadfall's suppress + tether (handles Overload behaviour and pins elites), Weaken to gut champion health for the team, an anti-champion artifact mod, or a champion-stunning primary/heavy in the other two slots. Do not bring this into a GM expecting the gun itself to stun.

Verify notes

Damage type + ammo confirmed in manifest (`item 3698448090`): `defaultDamageType=4` (Void), `ammoType=2` (Special). The other Choir hash (`3083189562`) is a stub with no damage/ammo data — ignore it.
Exotic perk text (Command Frame) quoted verbatim from `exotics.md` line 215. Hidden Fanatical Lance hip-fire intrinsic confirmed via `inspect_item.py` on the weapon's socket list (perk hash 619537267).
Catalyst text is BLANK in our manifest dump (`catalysts.md` line 28 — no description present). The catalyst's effect is inferred from the weapon's catalyst socket, which lists Destabilizing Rounds Refit (plus Subsistence Refit / Onslaught Refit as the swappable alternates). Destabilizing Rounds behaviour (Volatile on multikill, spreading detonations) taken from `weapon_perks.md` line 58. Confirm in-game which refit the catalyst unlocks and whether it's a fixed choice or a swap — our snapshot can't see the catalyst's own description string.
Gyrfalcon's Hauberk "See Me, Feel Me" verbatim from `exotics.md` line 33.
All aspects/fragments verified against `docs/encyclopedia/aspects.md` (Stylish Executioner L153, Vanishing Step L195) and `fragments.md` (Undermining L23, Instability L15, Harvest L14, Starvation L22). No fallback to `knowledge/` needed except for the Destabilizing/Volatile trait behaviour text noted above.
Exact Volatile detonation damage, Weaken % (Deadfall 35% per `hunter_turncoat.md`), and Gyrfalcon overshield values are not in the encyclopedia — confirm numbers in-game.

Mod selection (masterworked — full allocation)

Piece	Mod · cost	What it does
Helmet (9/10)	Void Siphon 3e	Rapid Void weapon final blows create an Orb of Power.
	Void Siphon 3e	Rapid Void weapon final blows create an Orb of Power.
	Special Ammo Finder 3e	Increases the effect of all contributions towards the Special ammo meter.
Arms (6/10)	Utility Kickstart 3e fill	When your class ability energy is fully expended, your Armor Charge is consumed and you gain class ability energy for each Armor Charge used.
	Momentum Transfer 2e fill	Causing damage with a grenade reduces your melee cooldown.
	Fastball 1e fill	Increases grenade throw distance.
Chest (5/10)	Void Resistance 1e fill	Reduces incoming Void damage from combatants.
	Concussive Dampener 3e fill	Reduces incoming area-of-effect damage from combatants.
	Sniper Damage Resistance 1e fill	Reduces incoming damage from combatants that are at long range.
Legs (7/10)	Void Weapon Surge 3e	Your Void weapons gain a small bonus to damage while you have any Armor Charge. Your Armor Charge now decays over time.
	Void Weapon Surge 3e	Your Void weapons gain a small bonus to damage while you have any Armor Charge. Your Armor Charge now decays over time.
	Orbs of Restoration 1e	Picking up an Orb of Power grants a small amount of energy to your ability with the least energy.
Class Item (4/10)	Reaper 1e	Shortly after using your class ability, your next weapon final blow spawns an Orb of Power.
	Powerful Attraction 2e	Automatically collects nearby Orbs of Power when you activate your class ability.
	Bomber 1e fill	Reduces grenade cooldown when using your class ability.

All 15 sockets used, 10 energy per masterworked piece; costs from the manifest. Core mods are the build's engine; fill mods are strong defaults — swap freely (chest resists should match the activity's damage types).