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This book is for whoever is building on Blood Aria: Japan. Combat here is deliberately narrative-forward, gritty, and fast: a fight is a handful of beats resolved on one core roll, and the consequence that matters is the wound, the debt, or the reputation — not a grid of hit points. This chapter is the mechanical spine under that philosophy, how to run it, how to balance it with the schema, and how to adapt it if you take the system somewhere else.
Everything contested uses the Night Roll: one d10 + a stat modifier + edge, versus a threshold the Narrator sets.
Modifier comes from a stat on 3–18: 8–9 –1, 10–11 +0, 12–13 +1, 14–15 +2, 16–17 +3, 18–19 +4, 6–7 –2, 4–5 –3; equivalently floor((score − 10) / 2). The character stats object already holds all six. A creature's abilityScores gives you the same conversion.
Edge is a +1 per genuine advantage — help, training, a true-Silver blade, a Relic whose purpose this is, an oath actively honored. Cap stacking at +2 unless the fiction is extraordinary; letting edge creep upward is the fastest way to flatten every scene into a coin flip.
Thresholds — set by how far the odds actually favor the failing side:
| Situation | Threshold |
|---|---|
| Easy (day-to-day, fair) | 7 |
| Fair (even fight, alert foe) | 10 |
| Hard (outnumbered, feared, cornered) | 13 |
| Brutal (hopeless, star-rated) | 16 |
Read the result by margin M = (roll + mod + edge) − threshold:
Combat is resolved in a small number of beats, not rounds-of-turns-by-the-book. On your players' beats they hold one intent:
A fight decides in roughly two or three passes. If a combat has run past six beats, the question you were asking has stopped being a fight and become attrition — so end the scene and escalate to a wound or a set-piece.
Damage is largely narrated, but it needs a ledger. Composure is the pool that eats shrug-off harm: 6 + Constitution modifier + level (Constitution sits in the character stats; level in level). When a clean hit lands, composure absorbs it. At zero composure the next real hit is a wound:
Put plain descriptive harm in a character's notes, or a wound as an entry in inventory marked as a consequence, so the sheet itself carries the scar. Do not over-mechanize wound penalties — one number, –1 edge, is enough to make them sting without bookkeeping.
Combat in this world runs on literal blood. Track a session pool of blood dice (usually 2–4). Spend one to ignore a wound penalty for a scene, reroll a Night Roll, call a Relic or sprite gift, or keep fighting at zero composure for one more beat. Refill blood dice only by the things the world prices in blood: feeding, signing a blood-oath, cutting yourself into a furnace to carry a name. This makes the setting's fuel economy a mechanical cost at the table, not a lore aside — players start treating blood like the currency it is, because it is. Use it to make every ethical trade-off real.
None of these should be turned into flat attack bonuses that stack into the +2 edge cap. They are reasons to roll well, which is edge, and edge is capped.
The creature fields were built to feed this system directly:
stars (1–5) — narrative threat: how many wanderers it menaces and how many nights it takes to meaningfully hurt. A 3-star night rat is a dark-alley terror; a 5-star is a decision, not an encounter target.intensity (1–6) — mechanical deadliness that adjusts the threshold when the party engages it directly (caster 13 / brute 16). Keep stars and intensity roughly in step.role — minion / elite / boss. Minions fail loud and die fast; elites reward a clean win; bosses are set-pieces with an objective — an airship to cripple, a grudge (the grudgeMoment field) to break, a countdown to disrupt — never an HP grind.hitPoints, armorClass, initiative — treat as descriptive scaffolding: the Narrator reads AC as how hard it is to land, hit points as composure it owns, initiative as who frames the first beat. Convert d20-style DCs and hit bonuses from the details text into threshold-talk on the fly rather than copying them one-to-one — the moment the fight becomes a spreadsheet of mods, you've left this system.Pacing: the "war as weather" design means combat is optional, intermittent, and consequential. Vary the diet — some fights are set-pieces (stars roll in, a Houdini exit), some are decisions best declined, and the best-dressed session should end more often with a debt signed than a corpse counted. When a player wants to lose, let them — losing well is a lever, and the levers chain into the war's resolution.
If you lift this system to another setting, the moving parts stay: one core die, modifiers from a six-stat block, a threshold ladder, an edge cap, a short composure pool, wounds that scar, and one commodity the fiction already treats as currency turned into spendable dice. Everything that tingles like this world — silver, blood, reputation, daddy-light — is a skin on that skeleton. Change the commodity, change the named metals, keep the backbone.