You may have heard of D100s before, whether it’s rolling on a wild magic table while playing D&D, or in passing when games such as Call of Cthulu or Cyberpunk Red come up in conversation. While the sheer volume of numbers you can roll may sound intimidating, rolling a D100 just involves two ten-sided dice: a D10 and a percentile die (shaped like the image above), both of which are included in any standard rpg dice set.