D&D 5E DMs, how are you managing the Lucky feat?

[slaughterj]

How do you define the "result" of the roll? My DM says if he rolls a crit, I can't make him reroll because a crit is an auto hit so i know the result. I would define the "result" as the damage or the action that happens after the pass or fail. Not the pass or fail.

That's just asinine. It is a game. Games are supposed to be fun. Letting PCs use their abilities makes the game fun. Screwing PCs from using an ability to avoid taking a crit is not fun. In our games, I would expect some to use Lucky specifically to avoid taking a crit. PCs expend a significant resource, a feat, to get this ability - they could instead get a permanent +1 to hit and damage for instance - so it should be able to be used in all reasonable circumstances.

 

[Kalshane]

We're playing Roll20 and I do all the rolls in the open, so it's impossible to not know the result of a roll, but I have no problems with my player with the Lucky feat saying "I'm spending a Luck point to re-roll that" after any roll he makes, or their opponent makes against him.

The DM did call shenanigans (and I agreed) in a game I'm playing in where the player with the Lucky feat was trying to use it to accept the Dis/Advantage roll if it was better. (We have Roll20 automatically roll a second D20 to speed things up when someone has Advantage or Disadvantage. If they don't have it, we just ignore the second roll.)

In a face-to-face game I'd probably make the player decide to use Lucky after seeing the die roll, but before knowing the results, but I wouldn't have a problem with him choosing to re-roll a natural 20 against him (even if it's known that it's a crit and auto-hit) or re-rolling a natural 1 of his own (even though he would know that it was a failure.)