I run a 5e campaign, and I like rewarding my players for thinking outside the box, roleplaying well, etc. Suppose we have the following scenario:

Violet is a bard, and is attempting to intimidate a city guard while they are alone. The nearby torches suddenly dim and flicker uncertainly. Various objects shake violently and fly about the room, crashing into the walls, tables, and each other. Violet makes a wonderfully scary and venomous threat to the guard.

Violet’s use of fun bard spells and the good roleplaying was great, and I want to reward her player on the Intimidation roll.

I see two possible ways to do this:

  • Grant the player advantage on whatever roll they’re making
  • Reduce the DC of the check (but by how much?)

How do these two methods differ from one another? Are there scenarios when one is preferred over the other?

up vote 33 down vote accepted

Mechanically, I would say the main difference is that advantage is easier and provides more stable results (As your result chances go from evenly distributed, to a favorably skewed curve). 5e favors using advantage/disadvantage as a quick, simple, effective way to deal with temporary bonuses.

Narratively, advantage is a temporary bonus to one action, while a change in DC is a change in the difficulty of the task being attempted.

Giving Advantage means the task is harder for Violet to fail

This means, narratively, that thanks to Violet's special effects, the guard will be more likely to be intimidated by the next thing that comes out of Violet's mouth. The bonus is only for Violet's next action (or until the effect that gives Violet advantage no longer applies to the situation).

Changing the DC means the task has changed

This would mean the guard has lost their composure, and they will think everything is more intimidating/scary. In this case, the bonus applies to Violet and to anyone else attempting the same task.

As another example, building a partial bridge over a gap doesn't make jumping over easier; the jump you have to do to get across is now an easier task for everybody.

  • 1
    I'd also add that giving advantage makes Violet's player feel more special and skilled. – L.S. Cooper Dec 4 at 18:53

Just give advantage

I’ll get to the math in a minute, but the math really should be moot: there is no guidance for altering DCs based on PC actions because the point of the advantage mechanic is to eliminate the hundreds of ways of tweaking situational probability.

Advantage (and disadvantage) exist entirely to handle exactly these sorts of situations. Avoiding using it is fine if you’re into homebrewing your game rules, but if you’re wanting to just use the methods the game provides, give advantage.

The math, in very brief

Advantage is equivalent to reducing a DC by 5… sometimes. That’s the average case. How much advantage is actually worth depends on what your original DC and roll bonus are, because the probability for the highest of two dice beating a target number is a curve instead of a straight line.

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    Might be worth noting that advantage will not make the impossible possible, lowering the DC may. – Dale M Oct 23 at 21:53
  • I edited to clarify that “average” isn’t the average of possible equivalent values (that seems to be an unlikely average to care about in practice), but rather the (very rough) average DC faced. – SevenSidedDie Oct 23 at 23:19

Advantage is the usual way

DnD 5e seldom uses situational modifiers to rolls. Advantage is the usual way for the system to describe something is particularly easy because of some circumstance. Advantage is more conventional than lowering the DC, and your players are more likely to be used to it than changing modifiers or DCs.

Advantage is more transparent

Unless you tell the player that the DC has changed, they won't know their cool plan had any effect. Advantage on the roll is transparent and serves as a good reward for playing the character's strengths well.

Advantage affects the numbers more smoothly

Having advantage on a roll squares your chance of failure. Importantly, this means failure never becomes impossible because of advantage. Lowering the DC or granting a bonus modifier is just a flat decrease in the failure chance of five percent points per point of DC decreased - and notably, this can reduce the chance of failure to zero (especially if the Bard in question has Expertise in Intimidation).

Overall, Advantage is the way to go. It's clear, it's the usual way to do it in 5e, and it changes the probabilities smoother than changing the DC.

  • While I agree with your "transparency" point, I don't know that "transparent" is the best word to use to describe it, given that the effects on the actual probability of success are generally rather opaque. If I need to roll 13+ and the DC is reduced by 4, I immediately know my chance of success went from 40% to 60%. If I get advantage, then I need to either look up or calculate the new odds of succeeding. Going off the previous comment, maybe change it from "transparent" to "feels more like a reward"? – Dave Sherohman Oct 24 at 9:30
  • @DaveSherohman Hmm, the point I'm trying to make that it makes it clear that one's odds have improved in a tangible way (even if the actual magnitude of the effect is unknown). Would you have a good way to phrase that? – kviiri Oct 24 at 10:10
  • Unfortunately, no, I don't have any better suggestions than the "reward" phrasing in my previous comment, which doesn't quite seem to fit with what you say you're trying to convey. My comment was mostly driven by all the discussions of dice systems I've seen where people praise d20 or d% for "transparent" odds, while criticizing dice-pool systems (and especially pools with variable target numbers) as "opaque", which I think could confuse things when your answer is calling the single d20 roll less transparent than "pool of two d20s vs. variable target". – Dave Sherohman Oct 25 at 7:26

This is partly DM prerogative, but the Dungeon Master's guide does give handy guidelines.

The DC is typically more of a fixed thing, representing the difficulty of the task (though still set by the rules or the DM). For arbitrary tasks it gives some examples such as:

Easy = 10, Medium = 15, Hard = 20

However, the DMs guide speaks of advantage and disadvantage. There it says:

They reflect temporary circumstances that might affect the chances of a character succeeding or failing at a task. Advantage is also a great way to reward a player who shows exceptional creativity in play.

This quote sounds like it answers your question.

Giving advantage avoids any issues of trying to add up or subtract a whole bunch of DC modifiers; it is much more straightforward.

  • 4
    I would also state that narratively, the DC is a reflection on the task, and advantage on the character. If two characters are attempting the same task they should both be trying to hit the same target number, but modifiers and advantage tell the story of why one is more likely to succeed. – aherocalledFrog Oct 23 at 16:44

The task has not become easier, the bard just did a super good job. Because of that I think advantage is better. DC is how difficult a task is.

Here's an example of using a lower DC to intimidate a guard.

Player: Violet looks at the guard. She want so size him up to see if he is a tough guy.

DM: Roll Wisdom (Insight).

Player: Nice, 18!

DM: This guard has a big scar over his face and looks like he's seen a thing or two in this town.

Player: Yikes! Violet checks another entrance.

[...]

Player: Okay, Violet also sizes this guy up, I rolled another 18 on Wisdom (Insight), does she learn anything?

DM: This guard looks nervous. He looks to his side as he seems to hear something. A rat darts across the path. He jumps a little and quickly looks around to see if anyone saw him lose his cool.

Player: Perfect...

Since Violet is about to intimidate a guard who is more easily frightened I'd reduce the DC here instead of giving advantage. (However, if she still did the super cool stuff with her magic I would also still give advantage.)

  • 2
    "Since Violet is about to intimidate a guard who is more easily frightened I'd reduce the DC here instead of giving advantage." Or both rather, if she's also doing the super scary magic to boost her intimidation. – Kapten-N Oct 25 at 13:27
  • @Kapten-N That's a good point, I edited the answer to include this detail. – Captain Man Oct 30 at 17:47

As mentioned by SSD and kviiri, there is some mathematical difference, mainly in that Advantage is consistent and you don't need to calculate by how much you will change the DC.

Tezra also gives a good answer on the interpretation of it: Advantage means the character has some help, something that makes the task easier. A character climbing with a rope has advantage. Climbing something with no inclination has a small/no DC.

I will disagree with the two most upvoted answers, though, in that your scenario seems to be more about the Guard getting more scared of anything than of specifically Violet - but that is my interpretation of how I imagine the guard reacting1. Although mechanically advantage is easier, straight-forward and the standard way in 5e, this specific scenario might call for a reduction of DC.

A similar case happens in Lost Mine of Phandelver, where feeding the hungry and angry wolves will make the DC to calm them down lower, not only give advantage to the person who fed them. That's to say there is precedent in the published adventures for reducing the DC.

A character who tries to calm the animals can attempt a DC 15 Wisdom (Animal Handling) check. On a success, the wolves allow the character to move throughout the room. If the wolves are given food, the DC drops to 10.

Also, there is one mechanical difference that seems to not be mentioned until now: Advantages do not stack, additive bonus do - so, if you give a -5 to the DC, you can later on, because of some other action, give another -5 to the DC. If you give advantage, you will not be able to give another advantage later on. Note that this is intended to reduce the bean counting, in opposition to what happened in earlier editions.

Either way, a good rule of thumb, as mentioned by Tezra, is: If the task became easier (or harder) to everyone, or if you essentially changed the task, the DC changes. If someone has some kind of particularity that will help them specifically, give them advantage. In your scenario, say the guard is scared of Undeads and Violet disguises herself as a Zombie. That would be a clear advantage case.


1 To be clear, I'm imagining the guard becoming kinda paranoid and jumping scared even if a cat meow'd at him after all of this "supernatural" stuff, mostly because I'm imagining the guard does not know/understand that the bard is the one causing all this stuff and is pinning it on some supernatural stuff, like a cliche horror movie.

  • 1
    Actually, climbing a rope is a fundamentally different task from climbing a wall, that applies to everyone. I would change that example to climbing with/without climbing boots/gloves (that really helps you grip those narrow ledges) – Tezra Oct 24 at 17:25

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