The cubic d6 will be the die a lot of people visualize when anyone says "dice." 6-sided and numbered 1 - six, the d6 can be used to compute the injury of a melee assault, the damage or result of the spell, plus more. https://crithitceramics.com/mastering-the-dark-tone-running-a-campaign-with-a-goliath-wizard-in-dd-5e/