Dice System

What is the Dice System?

In TTRPGs, dice decide whether actions succeed or fail. That is the core of the dice system.

Why Use Dice?

Dice serve three important roles:

1. Randomness - Creates unpredictable developments
2. Fairness - Everyone has the same odds
3. Drama - The thrill of a critical success!

Types of Dice

TTRPGs use dice with various numbers of sides.

Dice Used in This App

The default is the d20 (20-sided die). When a scenario's author has chosen a different die, the AI GM asks you to roll that one.

How Checks Work in This App

The Flow of a Check

1. You declare an action
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2. The AI GM declares the check (what is tested, the target, the ability score, the die)
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3. You roll the die
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4. Your ability modifier is added to the roll
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5. A total at or above the target succeeds
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6. The AI GM narrates what happens

What You See Before Rolling

When the AI GM asks for a check, the check appears above the dice button.

Strength check   Target 14 or higher   Strength 13: +3
[ Roll d20 ]

You roll the die yourself. Press the button, the die tumbles, and the roll and the total are shown.

Example

Situation: You want to force open an old door

You: "I kick the door down!"

GM: "Strength check. Target 14 or higher."
    (Ability used: Strength 13 → modifier +3)

[Roll d20 → 11]

Total: 11 + 3 = 14

Result: Success! The door opens.

Ability Scores and Modifiers

At character creation you spread 40 points over six ability scores (Strength, Dexterity, Constitution, Intelligence, Wisdom and Charisma). In a check, the AI GM names the ability score it uses, and that score's modifier is added to your roll.

Modifiers on a d20

Every 4 points add +1, up to +5. Putting every point into one score still does not make a check automatic.

Modifiers on Other Dice

On other dice the modifier is scaled to the same share of the die. A score worth +5 on a d20 is worth +2 on a d6 and +25 on a d100.

Checks Without a Modifier

The roll stands on its own when:

• No ability score fits, such as a pure test of luck
• The scenario's own rule already builds the character's abilities into the chance

Target Guidelines

The AI GM sets the target from how hard the task is. Your ability scores count through the modifier, not the target, so the same task has the same target for everyone.

Criticals and Fumbles

Once you have rolled, the AI GM declares one of four results:

• Critical - Better than hoped
• Success - It works
• Failure - It does not work
• Fumble - Something goes wrong

Rolling the highest face (20 on a d20) lights the die up in gold, and rolling a 1 lights it up in red.

FAQ

Q: Can I roll the dice myself?

A: Yes. You press the dice button for every check.

Q: How do my ability scores count?

A: The AI GM names the ability score for the check, and its modifier is added to your roll. Before you roll you see something like "Strength 13: +3", and afterwards the total, such as "10 +3 = 13".

Q: Where can I check the result?

A: In the log. It keeps the check, the target, the roll, the modifier, the total and the result the AI GM declared (success, failure and so on).

Strategic Dice Usage

1. Risk Management

Avoid checks with a high target when you can

• Look for another approach
• Prepare before taking the challenge
• Ask an NPC for help

2. Play to Your Strengths

Actions that use your character's strongest ability score get the biggest modifier. If you are strong, kick the door down; if you are clever, work out the mechanism. How you act decides which score the check uses.

Next Steps

Once you understand the dice system, try playing:

• Character Creation - Plan how to spread your points
• Scenario Guide - Scenarios perfect for practice
• What is TTRPG - Review the basics

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🎲 Good luck! May the dice be ever in your favor!