I can’t say I’ve given it a lot of thought, but I think I need to go with the d12. It’s a good solid die that sadly doesn’t see a lot of use.
Going through my “Cup of Shame” (the beer pitcher full of polyhedrals that is used by players who forget to bring their own dice), I found I have a surprising number of them. When I considered that each d12 represented a once-complete set of dice, I started to appreciate just how many dice I’ve had over the years.
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A bunch of twelve-sided dice from my collection. Credit: Ken Newquist.