Reference summary · Core rule · Rules Tome 2.0.8 § 105
Die rolls
Natural 20 is a critical success and natural 1 is a critical failure; tied opposed critical rolls must be rerolled.
How it works
Rule explanation
Critical results automatically succeed or fail and cannot be changed or rerolled by effects. Opposed rolls are an exception: identical results are rerolled with the same modifiers, and two critical successes or two critical failures are rerolled regardless of modifiers. A natural roll is the rolled or preset result before modifiers. If an effect rerolls a roll made with multiple dice, all dice are rerolled. A preset result remains preset despite reroll or extra-dice effects; initiative has special rules for tied presets.
At the table
Example
Two Warlords both rolling natural 20 reroll initiative even if their initiative bonuses differ.
Watch for this
Common mistake
Bonuses do not turn another number into a natural 20, and penalties do not turn another number into a natural 1.