The point of dice result are to be random, could you be more precise with what you mean? The dierolls on Roll20 are fair and cannot be tampered with, but you probably didn't mean that. Are refering to choose a die from a pol of thrown dice, like "pick highest value of 4d10 thrown"? That kan be achived with "4d10k1". Look here for more info on how to modify your rolls: <a href="https://wiki.roll20.net/Dice_Reference" rel="nofollow">https://wiki.roll20.net/Dice_Reference</a>