Rule: Rolling dice

We alway use a twenty-sided die (d20) You’ll roll it on four occasions :

Checks: The majority of die rolls you’ll make are Checks.
For these, you’re trying to roll 21+ to succeed (d20 + Aptitude).
On 31+, the Check is considered a Critical Succes.
Contests: A Contest is the same as a Check, but you also need to roll higher than the characters you’re competing against to succeed.
Attacks: When making an Attack on an opponent, you’re trying to match or exceed your target's Defense Rating to hit.
A Critical results can happen depending of how much you roll above or under the target Defense Rating.
Tables: Occasionally you’ll roll on a table to see what happens.
The result of your roll is then referenced against a list of outcomes (for example, when determining the type of Injury you suffer).

Bonuses & Penalties

Bonuses and Penalties represent positive and negative factors that influence your chance of success. They are applied to your roll because of an Ability, a rule, or at the discretion of your GM. There are two levels to Bonus and Penalty :
(Bonus add to the roll, while Penalty substract to the roll)

Minor (2)
Major (4)

Applying Bonuses & Penalties Only one Bonus or Penalty applies per roll.

You can’t combine a Minor and a Major Bonus/Penalty.

Two Minor Bonuses or Penalties combine into a Major one.

Bonuses and Penalties cancel each other out when they’re equal.
A Major Bonus becomes Minor if a Minor Penalty applies (and vice versa).

Advantages & Disadvantages

An Advantage provides you with another chance to succeed, while a Disadvantage gives you another chance to fail.

With an Advantage, roll twice and take the better result.
With a Disadvantage, roll twice and take the worse result.

Applying Advantages & Disadvantages Only one Advantage or Disadvantage applies per roll.
If both apply, they cancel each other out.

Critical rolls

Critical rolls represent extreme luck or badluck and override the normal success or failure.
The effect of a Critical results is usualy determined by the GM, but in the case of a Critical Success, you can request a specific outcome to the GM.

Guideline on the impact an Aptitude has regarding to Critical results : Each point above 11 in an Aptitude add an additional 5% Critical Success chance. Each point under 9 in an Aptitude add an additional 5% Critical Failure chance. So an Aptitude of 9, 10 or 11 mean being average, with no additionnal chance of Critical Success or Critical Failure.

Critical Success

Rolling a 20 on a d20 is always a Critical Success. Special rule :

During a Check (or Contest): Rolling a result of 31+ is considered a Critical Succes.
During an Attack: Rolling 10+ above your target's Defense Rating is considered a Critical Succes.

Critical Failure

Rolling a 1 on a d20 is always a Critical Failure. Special rule :

During a Check (or Contest): Rolling a result of 10 or less is considered a Critical Failure.
During an Attack: Rolling 10+ under your target's Defense Rating is considered a Critical Failure.
Failing an Attack in melee with a Missile Weapon is automaticaly considered as a Critical Failure.