A player of mine just took the Lucky feat (PHB, p. 167), which is a very nice feat, but some questions have popped up.
The Lucky feat allows a player to use a luck point on attack rolls that happen against them. The second bullet says:
You can also spend one luck point when an attack roll is made against you. Roll a d20, and then choose whether the attack uses the attacker's roll or yours. If more than one creature spends a luck point to influence the outcome of a roll, the points cancel each other out; no additional dice are rolled.
The earlier bullet point states when the player is attacking, they can reroll after their roll but before the results are determined, the second block does not contain that information.
Here is the first bullet:
Whenever you make an attack roll, an ability check, or a saving throw, you can spend one luck point to roll an additional d20. You can choose to spend one of your luck points after you roll the die, but before the outcome is determined. You choose which of the d20s is used for the attack roll, ability check, or saving throw.
So must the player decide before the DM rolls attacks against the player with the Lucky feat? Or should the DM roll but do so where the player can see? The assumption is that he must decide before I tell him that he is hit, but if I say I just rolled a "XX" the player knows his Armor class but may or may not know the Monster's "to hit" bonus.... so it may or may not be "determined".
Here is the crux of the confusion, the player has to determine to use their luck roll or the attackers, so (again another assumption) the player has some knowledge of the roll.... so when is the player given that knowledge? Or is is just a guess and they don't know the roll.