@Victorique, I've made the maximum number of dice to 4 and maximum sides 20. See if it works now. I'll probably have to put the command somewhere... for reference to anybody else: /roll XdY is the command, where X is the number of a Y-sided die.
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.