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 meaningfully changes

When attempting something risky:

Roll 1d20 + Attribute + Skill

Compare the result to a Target Number (TN).

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.

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.

Starting array:

+2, +2, +1, +0

Attribute maximum depends on campaign Tier.

Skills represent training or specialization.

Untrained skills default to +0.

Roll:

1d20 + Attribute + Skill

The GM may allow new skills appropriate to the setting.

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.

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.

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.

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.

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 do not stack beyond what is reasonable.

ODDS uses abstract distance:

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

Attacks beyond optimal range:

1. 2 per range band beyond intended use.

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, 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).

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

Conditions do not stack with themselves.

Shaken:

1. 2 to next roll

Wounded:

1. 2 to physical rolls

Frightened:

1. 2 to mental rolls

Restrained:

Movement prevented

Stunned:

Lose next Action

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

Advantage:

Roll 2d20, take the higher result.

Disadvantage:

Roll 2d20, take the lower result.

Multiple sources do not stack beyond one level.

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.

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.

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.

ODDS RPG Core v1.0 Playtest

Status: v1.0 Playtest Build (Locked for testing)