Luck. Color. Number of. Half of them have stories. The rest are waiting to.
Face gave me the orange speckled dice. I bought the blue and silver set to play a Harn demo at my first Fandemonium. The one that looks like a root beer float that reminds me of the old A&W on the highway near Milwaukee. The Origins dice we rescued in the midnight raid.
I don't have sets dedicated to mechanics. Just memories. That's all I have now.