MSRD:Basics
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The Basics
Dice Notation
These rules use the following die notations:
- d4 = four sided die
- d6 = six sided die
- d8 = eight sided die
- d10 = ten sided die
- d12 = twelve sided die
- d20 = twenty sided die
- d% = percentile dice (a number between 1 and 100 is generated by rolling two different ten-sided dice. One (designated before rolling) is the tens digit. The other is the ones digit. Two 0s represent 100.)
Die rolls are expressed in the format:
- [#] die type [+/- modifiers]
Example: 3d6+2 means: "Roll 3 six sided dice. Add the result of the three dice together. Add 2."
Rounding Fractions
In general, if you wind up with a fraction, round down, even if the fraction is one-half or larger.
Exception: Certain rolls, such as damage and hit points, have a minimum of 1.
Multiplying
Sometimes a special rule makes you multiply a number or a die roll. As long as you’re applying a single multiplier, multiply the number normally. When two or more multipliers apply, however, combine them into a single multiple, with each extra multiple adding 1 less than its value to the first multiple. Thus, a double (x2) and a double (x2) applied to the same number results in a triple (x3, because 2 + 1 = 3).
Basic Task Resolution System
These rules assume a standardized system for determining the success or failure of any given task. That system is:
- d20 + Modifiers vs. Target Number
The Modifiers and Target Number are determined by the type of task.
If the result of the d20 roll + the Modifiers equals or exceeds the Target Number, the test is successful. Any other result is a failure.
A "natural 20" on the die roll is not an automatic success. A "natural 1" on the die roll is not an automatic failure, unless the rules state otherwise.
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