Reaction rolls are an easy way to add variety to NPC interactions. This post will flesh out what modifiers to reaction rolls mean in practice, so players and GMs can anticipate the impact of skills, appearance modifiers, and other game elements that influence reaction rolls.
Reaction Rolls in Brief
Whenever the characters encounter an NPC, the GM can choose to make a reaction roll in order to determine how the NPC responds to the player characters. Rolling a reaction simply means rolling 3d6, applying any modifiers, and comparing the result to the reaction table (on pp. B560–561).
Unlike success rolls, higher numbers are better for reaction rolls: an 18 means that the NPC is very favorably disposed to the PCs, while a 3 is an extremely bad reaction. The other major difference between success rolls and reaction rolls is that success rolls have a target number, while the results of reaction rolls fall on a spectrum. The worst response is a Disastrous reaction, and the reaction possibilities go up to Very Bad, Bad, Poor, Neutral, Good, Very Good, and Excellent.
Interpreting Reaction Modifiers
So, what does a +1 reaction modifier mean in practice? How badly is the party in trouble if they get a -2 reaction penalty? This post will translate the modifiers into game results below. All the odds are rounded for simplicity.
First, let’s establish the baseline. In an unmodified reaction roll, the players have a better than 6-in-10 chance of getting a Neutral or better reaction, with a 25% total chance of getting a Good or Very Good reaction. The absolute extremes—Disastrous for a bad reaction, or Excellent for a good reaction—are impossible on an unmodified roll. In short, a neutral reaction means that PCs will generally be given a fair hearing.
With a net +1 reaction bonus, the PCs have an almost 75% chance of getting a Neutral or better reaction, and over 1/3 of the time, they will get a positive reaction. On the extremes, it is impossible to get either a Disastrous or Very Bad reaction, and there is a slight chance (0.5%) of getting an Excellent reaction. A little social influence goes a long way to smoothing edges, so negative reactions are exceptions rather than the rule.
A net +2 bonus shifts expectations even further. Over half of the time, the PCs will get a Good reaction; Neutral is now below expectations! The odds of getting a Bad or Poor reaction are only 16%. In other words, it is unusual for NPCs to dislike the PCs when they have a net +2 bonus.
If the PCs can earn a +4 reaction bonus (which is attainable by a combination of appropriate skill use, appearance or reputation modifiers, and/or situational modifiers), they will get a Good or better reaction three times out of four. In addition, they have an almost 10% chance of getting an Excellent reaction, zero chance of a Bad or worse reaction, and less than 5% chance of getting any reaction below Neutral. It’s really hard to hate someone with a +4 bonus!
Above +5 net bonus, and we’re getting into saving-babies-from-burning-buildings territory: the median reaction is Very Good, the PCs have double-digit percent chances of Excellent reactions, and it requires the equivalent of a critical failure to get a less-than-Neutral reaction (and by +7, even the worst dice can’t cause a negative reaction).
On the negative side, a net -1 reaction penalty is tolerable: the average roll will still be a Neutral or better reaction, and there is no chance of either extreme (Disastrous or Excellent). However, the odds of getting any positive reaction have fallen by about 10%, while the chances of getting a Bad or Very Bad reaction have nearly doubled (from 9% to 16%). Another way to look at the -1 penalty is to say that you have 50% odds of a negative reaction vs. a 50% chance of a Neutral-or-better reaction. Neutral is now a good outcome.
With a net -2 penalty, the expected result shifts down to a Poor reaction, and the PCs will have a below-Neutral result almost 2/3 of the time. There’s still no chance of a Disastrous reaction, but the odds of a Very Good reaction have fallen to 0.5%. With this level of distaste, the PCs are consistently getting started on the wrong foot and having to recover from their social missteps.
At a -3 penalty, Disastrous reactions become possible, while the odds of a Good reaction fall below 5%. There’s still a 1-in-3 chance of a Neutral reaction, but that’s definitely an above-average outcome. When the penalties get up to -4, the PCs have an equal chance of getting a Disastrous reaction as they have for getting any kind of positive reaction!
Once the penalties combine for a -5 modifier, the PCs should probably hide their faces and prepare to be ambushed: they will experience a Bad reaction almost 2/3 of the time. Even a Neutral reaction will occur less than 10% of the time; this is the level where people are no longer willing to let bygones be bygones.