- 5d6-keep-N
- The dice mechanic. Players roll five six-sided dice and sum a number of them based on their tier in the relevant domain (Trained = keep highest 3; Proficient = keep highest 4; etc.).
- Background
- A character archetype that shapes a starting character's flavor, +1/−1 tier modifier, signature item, hook, and mechanical perk. Eleven core Backgrounds.
- Base Tier
- The character's permanent, written-on-the-sheet tier in a domain. Set at character creation, modified by Background, advanced through play. Stable.
- Broken
- A pool full of Stress. The character is Impaired in that domain. Still able to act, but at brutal disadvantage. Pushing past Broken triggers a serious narrative consequence.
- Crit
- Shorthand for Critical Success. In combat, doubles damage.
- Domain
- One of six broad areas of competence — Body, Mind, Voice, Hand, Heart, Spirit. Domains replace skill lists.
- Effective Tier
- The tier the character is currently operating at, including all situational modifiers (Stress, world effects, equipment, ally support). Volatile. This is the tier used for the dice roll. Capped at ±2 from Base.
- Opposed Roll
- Both sides roll; higher result wins; defender wins ties.
- Outcome Bands
- The five possible results of a roll — Critical Success (beat T by 7+), Success (meet T to T+6), Mixed (miss by 1–4), Failure (miss by 5–9), Catastrophic Failure (miss by 10+).
- Pool
- A character's resource reserve in Body, Mind, or Spirit. Sized by Base Tier (1/2/4/6/8). Holds Stress.
- Push
- Spending 1 Stress to reroll a failed roll. Universal mechanic across all three pools.
- Stress
- The currency of pressure. Accumulates in Pools from external pressure (damage, fear, cosmic strain) or from voluntary spending (push). Tracked as filled bubbles.
- T-number
- A target number to beat. Written T11 (Standard), T14 (Hard), etc. Difficulty bands are T8 / T11 / T14 / T17 / T20+.
- Tier
- A character's level of competence in a domain. Five tiers — Impaired, Untrained, Trained, Proficient, Expert. Determines how dice are kept.