d30s

A d30 is a thirty-sided die used in tabletop role-playing games and other games of chance. Unlike more common dice like the d6 (six-sided) or d20 (twenty-sided), the d30 is less frequently encountered but offers a wider range of results for specific game mechanics. Its shape is typically that of a thirty-sided trapezohedron, a polyhedron with 30 faces that are kites or rhombi.

The primary function of a d30 is to generate a random number between 1 and 30, inclusive. This can be used for various game purposes, such as determining the outcome of an attack, the success of a skill check, or the amount of damage inflicted. The broader range of outcomes compared to a d20 means that a d30 can introduce a finer degree of granularity or a larger potential swing in results, depending on how it is implemented in a game's rules.

While not as ubiquitous as twenty-sided dice, d30s are available from specialty dice manufacturers and are sometimes used in games that require a larger number of possible results. Their less common nature can add a unique element to gameplay for those who choose to incorporate them. The mathematics behind a fair d30 ensures that each of the thirty faces has an equal probability of landing face up, providing an unbiased random number.