A bonus reroll is a dice mechanic that allows a player to increases a resolution roll's chance of success by re-rolling one or more of the dice after the initial result is determined (but possibly before the outcome is announced).

Advantage in games like Dungeons & Dragons 5th edition is mechanically similar to a bonus reroll of 1 dice, but advantage takes effect before the initial roll of the dice and a bonus reroll take effect afterwards and only if necessary.

Community content is available under CC-BY-SA unless otherwise noted.