Questions tagged [dice]

For questions primarily about dice themselves: polyhedral solids used to generate random numbers. In tabletop RPGs, dice are the most common means of introducing chance into the proceedings. Many players enjoy collecting dice of varying colors and shapes.

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3
votes
2answers
70 views

What target numbers would be a certain level of difficulty under this system?

I’m writing a homebrew game system, and I found that I have an action resolution mechanic but not a good system for target numbers (I call them Success Thresholds, or STs, in this game, and from now ...
4
votes
3answers
227 views

Which modifier added to a 1D20 has the closest outcome probability as rolling 2D20 with advantage with no modifier? [closed]

I'm trying to determine the probability of every modifier to a 1D20: 1D20 +1 1D20 +2 1D20 +3 1D20 +4 1D20 +5 vs flat 2D20s with advantage ...
15
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5answers
6k views

A player rolls several 20-sided dice, takes the lowest value, ignores the rest. What is the probability of this value being at least 7?

I'm designing a tabletop game, and I need to figure out how to calculate a few probabilities: Roll 3 20-sided dice, take the highest value. What is the probability of it being 7 or higher? 15 or ...
-2
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2answers
128 views

All the different mechanics that offer rerolls/replacement results [closed]

Can we get an exhaustive list of ways to reroll, or change the result of, a die? I'm currently only concerned with yourself or your allies rolls.
6
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1answer
126 views

Optimal algorithm for building raises in 7th Sea?

I'm writing a Discord bot for an online 7th Sea campaign. Players will type something like roll finesse 4 + weaponry 3 + 1 and the bot will spit out something like 3 raises (9+2, 8+3, 6+4, ...
28
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2answers
611 views

What game uses yellow 20-sided dice with letters and arrows?

Full disclosure: These are from my own online store (see my profile.) I've sold a small number of them over the years to dice collectors, but I don't know why anyone would want them or what they are ...
6
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2answers
582 views

How can I calculate the distribution of “Roll 3D6, reroll any dice once, treat all 1's as a 2” in AnyDice?

I'm wondering how to use Anydice to calculate the following: Roll 3d6, treating all 1's as 2's, you may reroll each die once, so we do this if the roll is below the average. So 3d6, can reroll each ...
3
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0answers
85 views

Resources on dice rolling for Rolisteam

Where can I find reliable instructions as to how dice rolling programming works with Rolisteam specifically (I use 1.8.2)? All I can find is about DiceParser (which seems to be the base code used in ...
27
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10answers
5k views

Is it possible to emulate common polyhedral dice rolls using just a d6, and if so, how?

This is a question that I've asked myself numerous times, but I've never gotten a really satisfying result. The issue is this: let's assume we only have one or multiple d6 dice (arguably the most ...
7
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2answers
378 views

Is probability of succeeding an opposed check the same when the second check is passive?

An "opposed check" is a well-known kind of check in many games, when two opponents roll dice, add modifier and compare results. It differs from a convenient dice roll when you compare your result ...
2
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0answers
75 views

How do attack rolls and criticals affect a 2d6 vs 1d12 damage roll? [duplicate]

For example, given the probability distribution between two similar weapons: D&D 5E Weapons - Basic Rules pg.48: Damage Discrete Distribution - AnyDice: Its evident that Greatsword is more ...
24
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8answers
3k views

How to approximate decaying probability distributions with few dice?

I am looking for ways to generate a probability distribution using dice which produces results that are skewed towards lower numbers, ideally as some kind of smooth decay. For example, imagine a ...
1
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0answers
87 views

What is the odds of rolling specific numbers on 4 d20s? [closed]

If I roll 1d20, then 1d20, then 1d20, then 1d20 (effectively 4d20), what are the odds that I'll roll specific numbers? For example, all 20's, or a combination of numbers such as (1, 16, 16, 1)?
28
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6answers
11k views

Why do most people consider a “00” and a “0” on a percentile roll a 100?

Assuming the results of a percentile roll ranges from 1-100, why would the results of a "00" and "0" roll be read as a "100"? In any other context outside of a percentile roll, the "0" on a d10 is ...
34
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24answers
7k views

Simulating these special dice on more regular dice

I've got a game that uses special dice for its resolution. Basically when making an opposed check, each side rolls a bunch of them based on the relevant trait, and whoever rolls most points wins. The ...
4
votes
1answer
650 views

Fantasy Grounds - How to repeat a dice roll of 4d6 drop lowest

I'm trying to roll up a new character in Fantasy Grounds and ideally want to roll 4d6 and drop the lowest. So far I can do: /die 4d6 Questions: How do I 'drop ...
4
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1answer
197 views

Has anyone done research on average RPG probabilities?

I've been looking at designing an RPG system lately and I'm currently considering where to set the "difficulty" of a roll at to get some satisfying results. I'm wondering - has anyone researched some ...
5
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5answers
1k views

I have a player that rolls TOO well. Is this a problem and how can I help it? [closed]

I have been running a home D&D game for the past year now with the party consisting of 5 players; a monk, a paladin, a ranger, a wizard and a druid. The Ranger was the last person to join the game ...
2
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2answers
125 views

What homebrew dice mechanic can I use for PvP in Amazing Tales?

I've recently started playing Amazing Tales with my children. As a summary of basically all the mechanics of the game (it's pretty simple since it's targeting children), each character has four skills,...
5
votes
1answer
278 views

How would this House Rule for combined Advantage/Disadvantage Impact Rolls?

According to the rules for Advantage/Disadvantage: If circumstances cause a roll to have both advantage and disadvantage, you are considered to have neither of them, and you roll one d20. This ...
10
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3answers
652 views

Is there a way, other than having a Diviner friend, for a player to avoid rolling Initiative at the start of a combat?

I've been starting to theorize the following concept: a player who would... never... roll dice... ever. Not in combat, not elsewhere. No dice. Literally. But I have come across a major obstacle: ...
11
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1answer
470 views

What brand and style is this D20?

I've had this one die for nearly 30 years, and I just started sorting and displaying my collection so I'm trying to find out which brand/style it is so I can hopefully complete the set someday. I ...
7
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1answer
172 views

How can I calculate the probability of meeting a certain Difficulty Value on 3d6 with critical success/failure modifiers?

In one Fuzion-system variant 3d6 is used to resolve skill checks. A Task is given a Difficulty Value (DV) from 10 (easy) to impossible (30 and beyond). Characters can have primary attribute levels ...
13
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3answers
5k views

What uses does D&D 5e have for a d100?

After many years I've finally got around to buying a couple of d100s, because I think they're great fun, and percentage die are for wimps ;-) I am also in the middle of a 5e campaign, and I wondered ...
2
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1answer
302 views

What is the name of the online dice roller that makes it less likely to roll the same number sequentially?

I'm searching for an online tool a friend used in an RPG once, no more than two years ago. The tool is a dice roller that adjusted the probabilities of an otherwise fair dice roll to make it less ...
10
votes
1answer
512 views

What game uses glitter-filled dice with an arrow-like symbol with bracket-like symbols either side of it?

Note for reviewers, this question is a part of several similar questions. It has been broken down so as to not run afoul of other guidelines. Whilst they are almost identical, they are not duplicates ...
11
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1answer
485 views

What game uses dice with cyborg skulls in place of the 1 symbol?

Note for reviewers, this question is a part of several similar questions. It has been broken down so as to not run afoul of other guidelines. Whilst they are almost identical, they are not duplicates ...
16
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1answer
1k views

What game uses dice with engraved faces, weapon symbols, double weapon symbols and object symbols?

Note for reviewers, this question is a part of several similar questions. It has been broken down so as to not run afoul of other guidelines. Whilst they are almost identical, they are not duplicates ...
15
votes
1answer
671 views

What game uses dice with compass point arrows, forbidden signs, explosions, arrows and targeting reticles?

Note for reviewers, this question is a part of several similar questions. It has been broken down so as to not run afoul of other guidelines. Whilst they are almost identical, they are not duplicates ...
23
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1answer
3k views

What game uses six-sided dice with symbols as well as numbers on the 5 and 6 faces and a blank space where “1” should be?

Note for reviewers, this question is a part of several similar questions. It has been broken down so as to not run afoul of other guidelines. Whilst they are almost identical, they are not duplicates ...
32
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14answers
14k views

How many sets of dice do I need for D&D?

I just started playing and am borrowing my friends' dice every time we play. I am looking to buy my own. How many sets do I need to buy?
20
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4answers
855 views

How do I calculate how many of an item I'll have in this inventory system?

I beta tested a game last week with a pretty fun system. This system is called "Dés d'usure" (in French, because it will be a French game). I translate it into "Wear dice", but I'm unsure. When you ...
9
votes
1answer
262 views

I would like to simulate a die from Anima: Beyond Fantasy in the Rolisteam dice roller on Discord. Can I do that, and if so, how?

As I'm sure anyone who has played it knows, Anima has interesting dice behaviors. Manually keeping track of them is kind of a pain in the neck, so I was wondering if there was a way to implement them ...
10
votes
1answer
471 views

Is this d15 verifiably fair?

Following off of a question asking for how to make a d150 in which this d15 was mentioned in an answer, I was wondering if the linked d15 is fair (gives an equal distribution of results over its range)...
20
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12answers
6k views

How I can I roll a number of non-digital dice to get a random number between 1 and 150?

This question is not actually related to RPGs but is more of a real-world dice rolling scenario I'm looking for help with, from dice rolling experts. I'm currently memorizing the Book of Psalms, ...
6
votes
2answers
527 views

What is the average point buy of a stat array from a 6x6 matrix of “roll 4d6, drop the lowest die”?

For character creation my group sometimes uses a weird method to generate stats. We roll 6 stat arrays using 4d6d1 (rolling 4d6 and dropping the lowest), and arrange them on top of one another to make ...
18
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6answers
5k views

Does the shape of a die affect the probability of a number being rolled?

Let's say I have a standard D4 and a custom D8 that has printed 1-4 and then 1-4 again (for a total of 8 sides). Would both of these dice distribute the probably of rolling any given number equally? ...
5
votes
1answer
225 views

Is it okay to suggest a dice roll as a player?

I was wondering if it could be okay in certain situations to ask for, or suggest, a test when I feel it makes sense to do so but the DM didn't ask me to roll a dice? To be more precise, I'll ...
53
votes
8answers
5k views

How to approximate rolls for potions of healing using only d6's?

I want to make tabletop potions of healing out of corked vials (test tubes) filled with dice. Each vial would be labeled and filled based on the potion it represents. For example, a vial for a potion ...
22
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6answers
6k views

What is the difference between rolling more dice versus fewer dice?

Let's say there are two attacks: one rolls a 10d10 and the other rolls a 5d20. Assuming the modifier was the same, which rolls would have better chances of rolling average, and which would have ...
21
votes
10answers
3k views

How can the probability of a fumble decrease linearly with more dice?

I'm working on a simplified RPG system that uses only D6s, and I want a mechanic for fumbles/critical fails. Depending on how good the player character is, they have 1-5 dice to roll and they have to ...
23
votes
2answers
3k views

What is the Guild Die for?

I was gifted a set of Guildmasters’ Guide to Ravnica Dice, and, upon opening, I encountered the “guild die” (see the picture below). I’m a bit confused about what its purpose is. Could someone please ...
9
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2answers
1k views

How can I use AnyDice to simulate rolling 6d6, and dropping the 2 lowest and 1 highest dice?

I'm running a new D&D 5e campaign soon and I'd like to try rolling for stats with some guardrails. Doing some test throws at the table, I liked the look of rolling 6d6, then dropping the highest ...
25
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3answers
9k views

What abilities allow me to reroll or replace die rolls?

I am building a "lucky wizard" for my newest campaign. The concept is to use abilities and features that allow me to reroll (or replace rolls) attacks, abilities, and/or saving throws (such as the ...
6
votes
2answers
794 views

How can I set up a Roll20 macro to roll certain additional dice depending on the results of an initial die roll?

I am playing a wonderful homebrew campaign running D&D 5E via Roll20 (I have a Basic account), and I have just rerolled as a wizard. One of my spells, prismatic spray, requires that I roll 1d8 for ...
5
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2answers
111 views

How do I use the encounter chance tables in the AD&D 1e DMG?

I'm trying to set up a campaign and I'm not great at math. We play old school 1e AD&D. The 1e DMG gives two tables on page 47 for chance of an encounter. The base chance of encounter depending on ...
20
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6answers
3k views

How do I determine the probability of rolling various ranges of numbers on 4d10, 5d10, etc.?

After realizing that my knowledge of how probabilities function has waned significantly, I'm wondering what the probability of rolling multiple 6's or higher (6-10) on four 10-sided dice, five 10-...
5
votes
1answer
304 views

Chances to roll a number of results greater than 5 on a number of d10s

I'm trying to figure out how to implement a dice roller function. I would like to know the chance in % to get [1 to X] results of 6+ on [1 to 10] 10-sided dice. So, for example, I would like to know ...
7
votes
4answers
3k views

What counts as the lowest value on a percentile die? [closed]

If I'm making an image with a standard set of seven dice, all showing as having rolled the lowest possible result, I obviously want to have that be 1 for six of them, but what should I use for the ...
4
votes
3answers
2k views

In AnyDice, how can I calculate the number of successes in the highest dice in a given dice pool?

I've tried the following code output [count {5..6} in [highest 2 of 10d6]] Which yields 0: 99.90% 1: 0.10% However, these ...

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