Orin Calder hurling a glowing phial that bursts into teal and violet chemical fire
The Vitriol Arc in action — AI-generated dramatization art (2026-09-26). Fictional combat; no real person depicted.

Chemical Combat Arts

The six codified chemical combat arts of the Phialguard — reagent, delivery, and reaction for each. All fictional: a fan-made combat system for a fictional character.

How to read an art. Each art lists its reagent (the fictional brew), its delivery (how the phial or charge is delivered), and its reaction (what happens on impact). Doses are story units, not real measurements — nothing here is a real recipe.

The six arts

1. The Vitriol Arc

Signature art

Reagent: vitriol teal — a clinging, brilliant teal liquor that burns cold and bright.
Delivery: high arcing throw; the phial is timed to break above the target.
Reaction: a sheet of teal fire that blinds and herds — Orin's opening move in nearly every recorded engagement. On the Green Glass Night he used it to light the barricade street so the defenders could see.

2. Marrowmist Veil

Reagent: marrowmist — a heavy violet vapor that sinks and spreads.
Delivery: rolled phial, broken low against stone.
Reaction: a crawling violet fog that deadens sound and sight. The Phialguard's retreat-and-regroup art; Orin famously veiled an entire alley during the Ashen Siege to evacuate a glassworks crew.

3. Catalyst Strike

Reagent: none carried — the art is in the gauntlet.
Delivery: a blow from the Alembic, his brass catalyst gauntlet, against a surface already wetted with reagent.
Reaction: the gauntlet's catalyst lattice detonates the residue on contact. This is Orin's close-quarters art: one measured smear, one strike, one very bad day for whatever is wearing the smear.

4. Gallowglass Etch

Reagent: gallowglass — a slow, patient acid that eats armor and locks.
Delivery: pressed phial or brush application; never thrown.
Reaction: over minutes, not seconds, it etches through plate, hinge, and chain. The quietest art in the codex — and the reason the Council of Measures keeps a file on him.

5. Sunfall Flash

Reagent: sunfall salt — crystalline grains that ignite white-gold in air.
Delivery: scattered by hand or burst from a broken phial at chest height.
Reaction: a flash like a dropped sun; temporary blindness in a thirty-pace radius. Orin's preferred answer to being outnumbered.

6. The Quiet Distillation

Master art

Reagent: kingswater, cut with nightshade violet — the most expensive draught on Crucible Row.
Delivery: a single phial, placed — not thrown — at the exact center of the engagement.
Reaction: a slow, silent, total reaction that ends fights by removing the *reason* for them: weapons slagged, cover dissolved, nobody able to stand quite where they stood. It is used once in the codex's current arc, and the [Episodes](/episodes) page treats it as the story's hinge. The name is also the title of the current story arc.

The doctrine behind the arts

Every art obeys the Phialguard doctrine: measure twice, throw once. In practice this means Orin is never the fastest fighter in a scene — he is the one who already decided where every phial would land before the first one left his hand. See Combat Style for the full doctrine, and the Field Manual for the reagent craft underneath it.

marginalia, in Holt's hand: "six arts, seven phials — the seventh is always the one you didn't throw."

Source notes