One Hero Engine: Quick Reference

Character creation

1. Assign Stats: 14, 13, 12, 11, 11, 11. You may redistribute up to 2 points between any scores.
2. Choose a Race.
3. Choose a Class.
4. Pick 3 Tags.
5. Choose a Casting Path (optional).
6. Finalize confirmed derived stats: modifiers, save specializations, AC, to-hit bonus, damage bonus, Soak, and MP if applicable.

Rules review required: Starting HP, HP gained by level, initiative baseline, default weapon damage steps, starting equipment, and spell counts are not defined consistently in the current source.

Attribute roles

Modifier guide

Modifier Formula: (Stat - 10) / 2, rounded down

Checks and saves

• Skill check: Roll 1d20 equal to or lower than the relevant stat.
• Non-spell save: Roll 1d20 + modifier against a TN set by the GM, scenario, or encounter.
• Spell save: Roll 1d20 + modifier against the caster’s Spell Save TN.
• Spell Save TN: Equal to the caster’s full stat score.
• Advantage (roll-over): Roll 2d20 and take the higher.
• Disadvantage (roll-over): Roll 2d20 and take the lower.
• Advantage (roll-under): Roll 2d20 and take the lower.
• Disadvantage (roll-under): Roll 2d20 and take the higher.

Difficulty numbers

Combat basics

• Turn sequence: Start of turn -> 2 actions -> 1 Trait if desired -> resolve rolls -> narrate -> enemy turn or Oracle twist
• AC: 9 + Dex modifier
• To-Hit: Higher of STR or DEX modifier
• Damage: STR for melee; DEX for ranged
• Soak: (AC - 10) / 2, rounded down
• Nat 20: Bypasses Soak
• Nat 1: Attacker takes damage instead

Rules review required: The current source does not define a full initiative rule, default enemy defence values, default weapon damage steps, or a complete combat-ending procedure consistently.

Damage steps

Damage conversion

Fray

• Levels 1-5: 1d6
• Levels 6-10: 1d8
• Overflow may hit another enemy with equal or lower AC

Rules review required: The current source does not define lower-HD foes, boss interaction, or full Fray eligibility consistently.

Morale

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

Oracle

• Roll 2d6: Chance and Risk
• Chance > Risk = Yes
• Risk > Chance = No
• Both dice 1-3 = Yes/No, but…
• Both dice 4-6 = Yes/No, and…
• Equal values = Yes, but… and gain 1 Twist Point

Twist Points

• Gain 1 when dice are equal, a Trait or Spell grants it, or a major failure is narratively impactful
• At 3 Twist Points, introduce a dramatic twist

Magic

• MP: 5 + casting stat modifier
• MP recovery: 1d4 after an 8-hour long rest
• HP to MP: Sacrifice 2 HP to recover 1 MP
• Mythic Spells: 3+ MP, once per session, always succeed

Rules review required: The current source does not define a universal casting roll, failed-casting rule, concentration subsystem, or global summoning procedure consistently.

Advancement