I am going with a slightly weaker variant of this idea, loosely based on a blog post here: Heroic Effort | A Butterfly Dreaming
By spending an action point, the players can roll a second die (and they must identify which die is the second die) on any d20 roll simultaneously with the standard d20 roll.
If either die is a success, the attack/skill check/ etc. is a success. However the second die cannot generate a critical hit or other special benefit for rolling a 20, and cannot be re-rolled through any power. Naturally, the original die can be rerolled and can generate critical hits. All modifiers to the attack can be applied to either die as appropriate.
This allows the players to - by spending an action point - significantly increase the odds of a particular hit landing but it does not increase the odds of a critical hit. But it is not quite as powerful as allowing them to wait until they miss and then choose to spend the action point.
Carl
By spending an action point, the players can roll a second die (and they must identify which die is the second die) on any d20 roll simultaneously with the standard d20 roll.
If either die is a success, the attack/skill check/ etc. is a success. However the second die cannot generate a critical hit or other special benefit for rolling a 20, and cannot be re-rolled through any power. Naturally, the original die can be rerolled and can generate critical hits. All modifiers to the attack can be applied to either die as appropriate.
This allows the players to - by spending an action point - significantly increase the odds of a particular hit landing but it does not increase the odds of a critical hit. But it is not quite as powerful as allowing them to wait until they miss and then choose to spend the action point.
Carl
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