The Core Mechanic
: Whenever you attempt an action that has some chance of failure, you roll a twenty-sided die (d20). To determine if your character succeeds at a task you do this:
• Roll a d20.
• Add any relevant modifiers.
• Compare the result to a target number.
If the result equals or exceeds the target number, your character succeeds. If the result is lower than the target number, you fail.
Dice - Dice rolls are described with expressions such as "3d4+3," which means...
Multiplying - Sometimes a rule makes you multiply a number or a die roll.
Rounding Fractions - In general, if you wind up with a fraction, round down, even if the fraction is one-half or larger.
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