d20 SRD :: Basics :: Core Mechanics

THE BASICS

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.

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