Dice

1d20

One twenty-sided die.

d20

The same thing. The count may be left off when it is one.

2d6

Two six-sided dice, added together.

1d20+5

A die plus a flat modifier.

3d8+2d6-1

As many parts as you like, added and subtracted. Every part needs a + or - in front of it.

4d6kh3

Roll four, keep the highest three. This is how ability scores get rolled.

2d20kl1

Roll two, keep the lowest one.

4d6kh

Keep exactly one when you do not say how many — kh alone means kh1.

1d20 adv

Advantage: rolls two and keeps the higher. Sugar for 2d20kh1.

1d20 dis

Disadvantage. “advantage” and “disadvantage” spelled out work too.

Advantage is a suffix on the whole expression and applies to the first die in it, so 1d20+5 adv does what you would expect. It only works on a single die: there is no meaningful reading of 4d6kh3 adv, and you will be told so rather than given something arbitrary.

A roll is recorded with every die shown, not just the total, and dice that were dropped are printed struck through rather than hidden:

So a result is checkable by anyone who can see it, weeks later, without taking anybody’s word for anything.

100 dice

Across the whole expression.

d1000

The largest die. The smallest is a d2.

20 parts

Added and subtracted terms in one expression.

40 a minute

Per person. Generous for play, tight enough to stop a flood.

On the campaign’s Dice tab. A roll box at the top of the tab, for when you want a number and not a scene — checking what a modifier comes to, settling something in chat, rolling for weather before you write the post. Nothing has to be open and nobody has to be posting. These count: they belong to the campaign and land in the log directly underneath, the same as a roll made in play.

In a thread. Every scene has a roll box under it, with shortcuts beside it for the ones people make constantly — a d20, advantage, disadvantage, a set of statistics. It checks your expression as you type, purely to tell you whether it is well-formed; the number it eventually shows comes from the server.

Inside a post. Attach rolls to what you are writing and they are rolled when the post is submitted and shown underneath it — one action instead of a post and a separate roll that somebody has to match up afterwards.

Off your character sheet. Skills, saves and attacks are buttons with the modifier already worked in, each showing the expression it is about to send. The label is calculated in your browser; the roll still happens on the server, from that expression, exactly like a typed one. Setting up attacks is what turns a swing into two buttons rather than two sums.

From your own sheet with nothing in play. A roll does not have to belong to a thread. Checking what a number actually comes to is a legitimate thing to do, and those rolls are recorded like any other — just not against a scene.

Under the roll box on the Dice tab is the record: every roll the campaign has made, filterable by person and by die, with the totals and the distribution of faces that have actually come up. Nothing extra is recorded to draw it; every face has been stored since the first day, including the ones a keep-highest threw away, and this is simply somewhere to look at them.

A roll in a scene names the scene and links to it. A roll made on the tab says “not in a scene” instead, and is counted exactly the same — it was still thrown by the server, and it still cannot be edited or deleted by anybody, including the GM and site staff.

Two limits, both stated on the page rather than left to be discovered:

A secret roll is counted for the people who may see it and absent for everyone else, so a GM’s figures and a player’s will not match — that is the secret roll working rather than a fault. And a roll made from a character sheet with no scene open belongs to no campaign, so it is not here.

Whoever is running the campaign can roll without the result being shown to the players. The roll still happens on the server and is still recorded in full, with every die, exactly like a public one. Secret means the players do not see it — it does not mean it did not happen or that it can be adjusted afterwards.