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At 9th level, the Barbarian has a class feature that reads:

you can roll one additional weapon damage die when determining the extra damage for a critical hit with a melee attack. (PHB 49)

The half orc has a similar racial trait as well.

This is a straight forward process if your weapon damage is a single die (great axe or smaller). However, with a greatsword, your weapon damage "die" is 2d6.

Does this feature mean you get to roll both d6s for the extra damage, or just one d6?

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I think it's worth pointing out the different language that the half-orc benefit has and the barbarian benefit. –  GMNoob Aug 24 at 10:15

5 Answers 5

up vote 9 down vote accepted

No, you only roll 1 additional die. The player's handbook is consistent in its use of the words 'die' and 'dice', where die is singular and 'dice' is singular or plural. A good example of this is on page 196 under Damage Rolls:

You roll the damage die or dice, add any modifiers, and apply the damage to your target.

There is also this quote that wotc_rodney tweeted (thanks GMNoob) which states that it is inteded to only be 1 die:

Also anyone that gets to roll one extra die on crits will favor the greataxe (like barbarians).

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This reading produces the strange result that a greatsword deals only slightly more damage than a two-handed longsword: 5d6 (17.5) versus 3d10 (16.5). That doesn't seem like an intended result. –  Bradd Szonye Aug 24 at 11:40
    
@BraddSzonye Strange is personal judgement and doesn't equal "must be unintended by the desingers" though. Regardless of whether the conclusion is correct or not, the reasoning is invalid as it's a logical leap, with the leap bridged by personal preference. –  SevenSidedDie Aug 24 at 21:17
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The quote suggests that this is to make axes more attractive than swords, but it also makes smaller swords relatively much better than a big sword, which is just kind of bizarre. That makes it sound like the quote is a spur of the moment rationalization rather than a considered design decision, so I don't think it's good evidence in favor of the ruling. –  Bradd Szonye Aug 24 at 21:23
    
@BraddSzonye How is a smaller sword much better than a big sword when the big sword still does higher minimum damage and higher average damage? –  briddums Sep 4 at 23:58
    
@briddums The key word is relatively. In all other cases, the barbarian ability makes bigger = a lot better, but in the case of swords, biggest = hardly better at all. That’s counterintuitive and thus I doubt it’s intentional. –  Bradd Szonye Sep 5 at 0:09

Just one d6.

I don't see anywhere that it specifically defines "damage die" for a weapon, but the fact that you roll one extra die, then two and three, indicates to me that you should only roll one extra die (of same the number of sides as the damage die or dice of the weapon).

For a similar construction, see PHB 196 which describes rolling "the damage die or dice" of a weapon, spell, or harmful ability.

This is in contrast to 4e, which specifically says that the "W" of a weapon is equal to its total damage, so that "2W" would mean twice the number of dice.

Additional Justification

5e is a game where the rules try to homogenize a lot of roles. Most classes either use strong armor or have easy access to non-armor AC of 13 + a modifier. Everyone has the same proficiency bonus at the same level. Et cetera. The designers have called the general concept here "bounded accuracy," but I think it applies to damage as well.

If you roll 2d6 each time, then the multiplicative effect means that by the end you'd be rolling an extra 6d6 in comparison to barbarians using most weapons, who would be rolling an extra 3dX. This doesn't seem consistent with the even capabilities shown elsewhere in the system.

From a realism standpoint, my interpretation of the rule would mean that while a Greatsword does a ton of damage all the time, you can't squeeze much more extra damage out of it. There's a limit to how much harm you can cause, even as a lucky and skilled barbarian.

Final Note

Of course, this doesn't matter too much. It only happens on crit, and the expanded critical ranges come with Fighter, so it's only likely to be notably broken once you reach Fighter 3/Barb 9. 12th level is a good time to deal arbitrary amounts of damage.

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This does seem like a logical parsing of the rules, but I have a hard time believing that it is intended. (I suspect it's just a side-effect of attempting to write the rules in natural language instead of as a technical code.) –  mattdm Aug 23 at 10:50
    
I'll edit to enhance my argument a bit. –  Gregory Avery-Weir Aug 23 at 11:56
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Other 2-handed barbarians would be rolling an extra 3d12...That's not a big difference from 6d6 (same max, different minimum, averages are 19.5 vs 21). So I'm not sure that's a particularly good argument. In contrast, if you don't get the second d6, you're rolling 3d6 vs 3d12, and that is a big difference (same min, much lower max, avg of 10.5 vs 19.5) –  wax eagle Aug 23 at 12:10
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Fair enough. Including the original weapon damage, that's 17.5 vs. 26 with "one additional... die" meaning one die, and 28 vs. 26 with "one additional... die" meaning two additional dice. So the damage is comparable and I'm arguing against myself. :) –  Gregory Avery-Weir Aug 23 at 14:07

Roll an additional 2d6.

The "point" of weapons with multiple damage dice is increased consistency, not reduced total damage potential, which rolling only one of the dice would obviously be.

I would consider this to be a case of "specific beats general" — the general case of the casual language in the "one additional weapon damage die" is replaced by the corner case where a few weapons actually have more then one die for weapon damage.

I think the intent of the wording is that you only add this once, and not any other additional dice from any other source (for example, Sneak Attack damage, which is normally rolled a second time in 5e critical hits — you don't roll that yet again with this feature).

It would be completely reasonable for there to be some special, intentional rules reason to pick axes over swords, but I don't think it is meant to be found in basically-obscure loopholes. The only thing like that currently is in the barbarian starting equipment list, which suggests a greataxe and handaxes (but which also allows other martial weapons). It would have been nice to see a feat or barbarian class feature instead, but it does not appear to be there. (Maybe in future material, if they ever get around to producing 5E class "splatbooks".)

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The one side effect of the other reading that would be useful, is that it would make the great axe a useful weapon. Right now there is literally no reason to take it over a greatsword. I favor this reading generally because it's the one that makes sense to me (why would you penalize someone for wielding a weapon with 2 "dice" as its "die" –  wax eagle Aug 23 at 11:58
    
@waxeagle: The same logic applies to a battleaxe vs a longsword; I suspect that the cheaper price of the base item may carry over to magical variants, as that's the only reason to choose a heavier axe over a more-expensive sword. –  DougM Aug 23 at 13:35
    
@waxeagle In a recent interview with mike mearls, (gamers with jobs) he said straight out that he is aware some people will think the greatsword is always better than the greataxe, but they preferd simplicity and flavor over equality when the difference is that small. –  GMNoob Aug 23 at 17:55

First of all, sorry for my English. You roll 1 additional die, in this case 1d6. This turns weapons with 1d12 more proficinet with "Criticals" than the ones with 2d6 that strike little more (average) damage. Bridmus explained well in his Post. I think this is done to vary the use of different weapon. A "Critical Based" fighter has more advantage with 1d12 weapons. Rolling 2d6 would turn Great Axe almost useless (if you play only with Maths). In the 3.5 for example Axe has 1d12 / x3 Critical, while 2 hand sword has 2d6 / x2, more or less in D&D Next it is the same, Axes are ment to be more "brutal" and very good choice for Barbarians

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Welcome to the site! Please try to add more information as to why you believe this to be the correct answer. (site sources,explain yourl ogic logic, etc.) –  GMNoob Aug 24 at 11:02
    
I forgot about the 3x critical thing from 3.5. Kind of a shame that didn't just make that a feature of axes. –  mattdm Aug 24 at 11:32

B r u t a l C r i t i c a l

Beginning at 9th level, you can roll one additional weapon damage die when determining the extra damage for a critical hit with a melee attack. This increases to two additional dice at 13th level and three additional dice at 17th level

on a Longsword the weapon damage die is 1d8 so extra 1d8

on a Maul the weapon damage die id 2d6 so extra 2d6

that's how i read it

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That's a very popular ruling, but counter to how the designers say it works. –  wax eagle Sep 28 at 18:05

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