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dco
Guest
Exactly.No defense is impenetrable so the player need not know the roll, just that they have an much increased chance of avoiding damage with this spell. It sucks when it fails, but it sucks when somebody saves against your charm person spell too. Just because its a limited resource, doesn't mean its guaranteed.
You can read the DM guide, precisely the book for the DM.To my knowledge the AC hit by an attack roll is not secret information. Nowhere in the making an attack section of the rules is there a step " Do not reveal the result of the attack roll. " I know this won't sit well with some people who believe the attack roll results need to be secret but there really isn't a reason to hide it.
The Monster Manual talks about monster attacks and says to refer to the rules in the Player's Handbook. So as far as I can tell the players and the DM use the same rules to have characters under their control make attacks. I guess players could not reveal their attack roll results to the DM and all combats stall out after one attack roll but the I honestly believe the roll results are meant to be shared so the game can continue past the first attack.