Sometimes, the Ref may ask for a roll of the dice.
The most common type of roll is a d20 roll.
The \gm sets a difficulty class (DC) and whoever is making the choice rolls the die and adds a modifier.
If the total is at least equal to the DC, the actor gets what they want.
Otherwise, they may fail or need to pay some price to succeed.
If a roll is a contest between two characters, the DC is equal 9+ the total modifier of the target. Otherwise, see below for guidelines on setting DCs.
What is this?
Basically I'm pretty set on a lot of the specific mechanics for my 3e-derived game. Here I'm trying to stretch myself and present only the stuff that's not about character creation, on account of that being the section of the ruleset I have a tendency to work too hard on without drawing the rest of the owl.
The form of what follows, presenting DCs by task rather than by skill (haven't included a skill list in here, but it will be much less granular than these categories) follows the first D&D Next playtest packet. The actual numbers are largely based on a d20ification of this analysis of the hidden d6 skill system of OSE/BX.