Resolving immediate defense actions in a PbP
So I’m in a quandary here. A player in my 3.5 Eberron PbP wants to know about a ring in the Magic Item Compendium that allows a person to, as an immediate action, declare they want to use the ring to gain a +2 deflection bonus to AC against a single attack. The ring can do this four times a day. At the table, I would simply tell the player, “X attacks you” and the player would let me know before the attack was resolved whether or not they wanted to use the ring. In a PbP, however, it’s not that simple.
I don’t like the idea of telling the player “X hits you for Y damage” only to allow the player to say “I would have used the ring!” and have to retcon everything. I think that puts too much power in the hands of the player. Also, I don’t want to slow things down just to ask the player “do you use the ring?” before every single attack against them in combat. OTOH, I don’t want to tell the player “no you can’t have it” because it’s a pretty cool “not in the face!” item.
So what ways could I do this to not slow things down and not put too much power in the players hands but still keep things fun and fair?

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Hypersmurf July 29th, 2009 at 1:43 PM
(Huh – the Security Word for this comment was ‘d20′! Cool!)
I recommend changing the paradigm of the ring slightly. Run as written, the information the player has is “You are being attacked”. He needs to decide based on that information whether or not he wants to apply one of his four chances at a +2. That attack might miss by 15, or might hit by 7… in either case, +2 AC makes zero difference. It only has an effect when the attack is in the range of AC+0 to AC+1.
So instead, make a deal with the player. He can nominate when the use of the ring is ‘on the table’ – “Not when we’re fighting the gate guards or the giant rats, but when that ogre comes back, I want the ring in the equation!” Or “Any time I’m below 15 hit points!”
And then set an automatic threshold – say the range AC-2 to AC+3. If his AC is 17, the ring will automatically expend a charge when the attack roll is between 15 and 20. If it’s exactly 17 or 18, the ring saves him! If it’s a 15, 16, 19, or 20, it doesn’t.
Given that normally, if he chooses an attack himself, the ring will save him on two numbers out of twenty on a die roll, it’s a pretty good deal for him… with the disadvantage being that it removes him a little from the decision loop. The advantage to you? It saves that extra two steps in the communication cycle of every single attack.
But he needs to make sure his “Ring is in play!” declarations or conditions are clear, just so you don’t get the “Aww, but I *would* have!” scenario you described.
-Hyp.