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With the Dual Implement Spellcaster feat, you can add the off-hand implement's enhancement bonus to damage rolls.

1) What if you cast a spell with the off-hand implement? Do you get nothing from the main hand implement?

2) Is it even possible to cast a spell through the off-hand implement or do you have to designate one of your hands as your main hand and hold the implement you use in that one?

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Your question title is very broad, and invites a detailed analysis of this poorly-explicated feat. Your queries in the body of this question are much more specific and deal more with questions of handedness that might apply to dual-weapon-wielding characters as well. Could you please clarify your intent? –  BESW Dec 28 '12 at 23:27
    
Not really sure how it could be any more clear, but I changed the title. –  Ravn Dec 29 '12 at 8:09
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2 Answers

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1. We get no benefit from the DIS feat if we cast with the off-hand implement.

2. We can cast through our off-hand implement...

...though we must designate main-hand and off-hand to determine the application of the feat as per above.

BUT: This is a weird fringe case with no explicit rules.

I'm gonna get wordy here, because so far as I can tell there is no official ruling on handedness as it relates to implements. The best we can do is look at weapon rules for these cases, and try to extrapolate, and then decide if that inference is valid.

Why am I talking about weapons?

Because Dual Implement Spellcasting did it first, and they're fundamentally the same thing for purposes of balance.

At their base mechanical function, weapons and implements serve identical purposes. They both provide a progressive enhancement bonus (+1 through +6) to the attack and damage rolls of powers channelled through them (and follow the same price advancement). With some bizarre exceptions they must both be held in at least one hand to be used. They each usually have powers or features that can only be used with attacks that use the item in question.

The feat in question uses a term ("off-hand") that is otherwise exclusively reserved for weapon mechanics. I believe that if they meant something more vague like "other hand," they probably would've said that instead; this may be optimistic on my part, but I'm running with it because I prefer "not so much leaping to conclusions as building elaborate cantilevered structures so as to reach conclusions more efficiently for prolonged periods."

So, what are the mechanics for off-hand weapons?

Off-Hand [from the DDI Compendium, also verbatim in RC 270]

An off-hand weapon is light enough that the attacker can hold it and attack effectively with it while also holding a weapon in his or her main hand. An adventurer can’t attack with both weapons in the same turn, unless he or she has a power that allows such an attack, but he or she can attack with either weapon.

I also found a parenthetical that may help clarify things, in the Two-Blade Fighting Style ranger feature [PHB1 104]:

(Make sure to designate on your character sheet which weapon is main and which is off-hand.)

Together these indicate that handedness is permanent: characters are not ambidextrous, nor can they choose to change which hand is their primary. "Off-hand" is a mechanical term that means something definable and permanent to a character. This is the crux of the issue.

Dual Implement Spellcasting grants no unusual handedness privileges or exceptions.

If we allow ourselves to generalize what we learned from the off-hand weapon rules, when we dual-wield implements we must signify which implement is in the main- and which in the off-hand.

The off-hand weapon rules I've co-opted for implements say we get to choose which implement to attack through without penalty. This is how I answered question two.

But, DIS only gives the damage bonus when attacking with the main hand. This is how I answered question one.

If we want to cast through the implement currently in our off-hand and gain the enhancement bonus from the implement currently in our main hand, we must switch implements to the other hands. Feats and items which allow us to do this efficiently are outside the scope of this already-lengthy answer, so I'll link to Bag of Blades: A Guide to Off-Hand Properties and Free Action Item-Swapping and RPG.SE's own (slightly outdated) What action type is switching two items between main hand and off-hand?.

[On a side note, staff and quarterstaff are two separate items: a staff is a one-handed implement which can be wielded as a quarterstaff weapon but not enchanted as one, and a quarterstaff cannot be used or enchanted as a staff unless an exception is explicitly made. I mention this because my research for this question brought up dozens of attempts to use DIS with a single staff.]

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Excellent, thorough and exactly what I was looking for. Answered all my follow-up questions, thanks! :) –  Ravn Dec 29 '12 at 14:44
    
@BESW - did you find any references other than the parenthetical Two-Blade Fighting Style reference that denies ambidexterity? My group has always played it as "your main hand is whatever you're attacking with, and that can change from action to action" –  Simon Withers Dec 29 '12 at 23:30
    
@SimonWithers Sure! The plethora of items and features and powers which treat handedness as permanent ("while you wield this weapon in your off hand" isn't "when you consider this weapon to be in your off hand"), and on a more inferred level the fact that many powers and feats (including this one) are obviously balanced on that assumption. (It also strains credulity that all adventurers are perfectly ambidextrous, but I won't argue realism on a 4e rules question.) –  BESW Dec 29 '12 at 23:51
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According to the official Online Character Builder, you do get the bonus on both implements.

If you build a character in the online builder and train the Dual Implement Spellcaster feat, then equip two implements and view a power, the breakdown analysis shows the off-hand enhancement bonus being added to both weapons.

Screenshot showing Dual Implement ehancement bonus

Note that the online character builder DOES differentiate between main hand and off-hand slots. In this example, if you equip your rod in your main hand and the rhythm blade in the off-hand, you get +2 shield AC/reflex; but if you equip the rhythm blade in the main hand and the rod in the off-hand, you only get +1 shield; rhythm blade must be wielded in the off-hand to provide its bonus.

Also note that both implements give the other implement's bonus as the "off-hand enhancement bonus" rather than both giving the enhancement bonus of the implement equipped in the off-hand. The Dual Implement Spellcaster feat states:

When you use an arcane attack power and you are wielding a magic implement in each hand, you can add the off-hand implement’s enhancement bonus to damage rolls.

Strictly speaking, this should mean that, if you attack with the off-hand implement, you should re-add the same implement's enhancement bonus to damage rolls. Clearly, the builder takes the other hand's implement bonus: when you attack with the +1 rhythm blade, you get +3 from the rod, not +1 from the "implement in the off-hand slot."

Therefore, if the builder does specify off-hand for rhythm blade and does not specify off-hand for dual implement spellcaster feat, I conclude that the Dual Implement Spellcaster feat is meant to operate as "other hand" rather than a strict interpretation of "off-hand."

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