Gaming Rules-design note One Hero Engine

One Hero Engine: Solo Play

The solo-play tools for One Hero Engine, centered on the Oracle, Chance and Risk dice, and Twist Points.

Archived version: One Hero Engine v0.12 is an archived development draft. It is preserved for design history and is no longer the current rules version.

Return to the current One Hero Engine rules.

Oracle and uncertainty

The Oracle resolves yes/no questions and generates narrative twists.

How It Works:

  1. Ask a yes/no question.
  2. Roll 2d6:
    • Chance Die represents hope/fortune.
    • Risk Die represents danger/chaos.
  3. Add an extra chance or risk die as needed based on Tags or circumstances.

Chance and Risk dice

Die RangeMeaning
1-3Low
4-6High

Oracle results

OutcomeResult
Chance > RiskYes
Risk > ChanceNo
Both dice 1-3Yes/No, but… (drawback)
Both dice 4-6Yes/No, and… (extra benefit)
Equal valuesYes, but… + gain 1 Twist Point

Twist Points

  • You gain 1 Twist Point when dice are equal, a Trait or Spell grants it, or a major failure is narratively impactful.
  • At 3 Twist Points, you must introduce a dramatic twist (e.g., an unexpected NPC, reality warps, or a new threat emerges).
  • You may also spend a Twist Point before reaching 3 to add a complication, alter a scene, or foreshadow danger.

Scene questions and opening play

The current draft clearly supports asking scene-shaping yes/no questions, but it does not give a full formal procedure for preparing scene prompts, setting scene difficulty, or choosing when to cut between scenes.

Rules review required: This procedure is not fully defined in the current published draft.

When to use the Oracle

Use the Oracle when the answer to a yes/no question is uncertain and the draft does not already settle the outcome through a direct rule.

The current published draft does not define a separate scene engine, random event schedule, or formal list of situations where the Oracle must be rolled.

Rules review required: The current source material does not define this procedure consistently.

Oracle examples

Chance 5, Risk 2

  • Chance is higher than Risk.
  • The Oracle answer is Yes.

Chance 4, Risk 4

  • The dice are equal.
  • The Oracle answer is Yes, but…
  • Gain 1 Twist Point.

The earlier combat-oriented example turns used ability names that are not preserved consistently in the current published draft, so they are not treated as authoritative here.

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Solo RPG One Hero Engine Homebrew Rules