====== Core System ======

ODDS RPG uses:
  * 1d20 for resolution
  * 2d10 for impact

The system is genre-neutral and supports cinematic but tactical play.

Only roll when:
  * The outcome is uncertain
  * Failure has consequences
  * The situation will meaningfully change

If nothing changes, do not roll.

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===== The Core Roll =====

When attempting something risky:

  Roll 1d20 + Attribute + Skill

Compare the result to a Target Number (TN).

^ Difficulty ^ TN ^
| Easy | 8 |
| Standard | 12 |
| Challenging | 15 |
| Hard | 18 |
| Extreme | 22 |

If the result meets or exceeds the TN, the action succeeds.

If the result is lower, the action fails and the GM introduces a consequence.

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===== Degrees of Success =====

If you exceed the TN by:

  5 or more → Strong Success  
  10 or more → Critical Success  

Natural 20:
  Automatic Strong Success.

Natural 1:
  Failure plus Complication.

Strong Success may grant:
  * Increased effect
  * Faster completion
  * Tactical advantage
  * +5 to Impact (if applicable)

Critical Success may grant:
  * Major narrative advantage
  * +10 total Impact (if applicable)
  * Significant positional advantage

The GM determines the exact benefit based on the situation.

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===== Attributes =====

^ Attribute ^ Represents ^
| Might | Strength, endurance, durability |
| Agility | Speed, reflexes, coordination |
| Mind | Logic, perception, technical ability |
| Presence | Willpower, charisma, leadership |

Starting array:
  +2, +2, +1, +0

Attribute maximum depends on campaign Tier.

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===== Skills =====

Skills represent training or specialization.

Untrained skills default to +0.

Roll:
  1d20 + Attribute + Skill

The GM may approve new skills appropriate to the setting.

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===== Impact Rolls =====

When a successful action causes measurable effect:

  Roll 2d10 + relevant modifier

Impact is used for:
  * Damage
  * Healing
  * Structural harm
  * Mental strain
  * Influence shifts

Armor reduces incoming damage.

Impact cannot be reduced below 0.

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===== Combat Structure =====

Combat occurs in Rounds.

At the start of combat:
  Each participant rolls 1d20 + Agility for Initiative.

Highest result acts first.

On your turn, you may take:

  1 Move  
  1 Action  
  1 Minor Action (optional)

You may trade:
  Move → Minor  
  Action → Move  

You may not trade a Minor into a full Action.

Keep turns concise and decisive.

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===== Actions =====

Common Actions include:

  * Attack
  * Cast an ability
  * Use complex equipment
  * Full Sprint (double move)
  * Assist an ally

Common Minor Actions include:

  * Draw or stow a weapon
  * Open or close a door
  * Stand from prone
  * Quick interaction

The GM has final say on action categories.

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===== Attacking =====

To attack:

  Roll 1d20 + Attribute + Combat Skill

Compare against the target’s Defense TN.

On a hit:
  Roll 2d10 + relevant Attribute for damage.

Armor reduces the damage taken.

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===== Defense & Positioning =====

Base Defense TN: 12

Modifiers:

Partial Cover:
  +2 Defense

Heavy Cover:
  +4 Defense

Prone:
  +2 vs ranged attacks  
  -2 vs melee attacks  

High Ground:
  +1 to attack rolls

Flanking:
  +2 to attack rolls when an ally threatens the target from the opposite side

Modifiers should not stack beyond what is reasonable.

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===== Range Bands =====

ODDS uses abstract distance:

Engaged – melee distance  
Close – same room  
Near – across open area  
Far – long range  
Extreme – sniper range  

Attacks beyond optimal range:
  -2 per range band beyond intended use.

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===== Health & Resolve =====

Health = 10 + Might  
Resolve = 10 + Presence  

Health measures physical durability.  
Resolve measures morale and mental stability.

When Health reaches 0:
  The character is Downed.

While Downed:
  You may take 1 Action per round.

If you take additional damage while Downed, roll 1d20:

  1–10: Unconscious  
  11–19: Stable but still Downed  
  20: Regain 1 Health  

If you take damage equal to your full Health again while Downed:
  You are dying (GM discretion).

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===== Resolve Damage =====

Some effects reduce Resolve instead of Health.

When Resolve reaches 0:
  The character is Broken.

A Broken character:
  * Cannot initiate aggression
  * Must retreat, surrender, or freeze
  * Recovers after the scene or meaningful support

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===== Conditions =====

Conditions do not stack with themselves.

Shaken:
  -2 to next roll

Wounded:
  -2 to physical rolls

Frightened:
  -2 to mental rolls

Restrained:
  Movement prevented

Stunned:
  Lose next Action

Conditions last until resolved by time, action, or GM ruling.

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===== Advantage & Disadvantage =====

Advantage:
  Roll 2d20, take the higher result.

Disadvantage:
  Roll 2d20, take the lower result.

Multiple sources do not stack beyond one level.

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===== Assisting =====

To assist an ally:

  Roll TN 12 using a relevant skill.

On success:
  Ally gains +2 to their next roll.

On Strong Success:
  Ally gains Advantage instead.

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===== Extended Tasks =====

Used for hacking, rituals, repairs, negotiations, or other multi-step goals.

Set a Progress Goal (3–10).

Each success:
  +1 Progress

Strong Success:
  +2 Progress

Failure may:
  * Increase danger
  * Add time cost
  * Trigger a complication

Extended Tasks should remain dynamic.

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===== Environmental Hazards =====

Fire:
  TN 12 Agility or take 2d10 damage

Falling:
  2d10 damage per range band fallen

Poison:
  TN 12 Might or lose 2d10 Health over time

Radiation / Corruption:
  TN 15 Might or lose 2d10 Resolve

Adjust TN based on severity.

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ODDS RPG Core v1.0 Playtest