Back in December of 2013, very shortly after the release of the second issue of Worlds Without Master, I made this post explaining some of the math behind Wolfspell that made its central mechanic so alluring to me. Below is a very subtly revised version of the post. I've been thinking a lot about this trick lately in the context of yet another game design. I do not know as of yet if that that game will see the light of day, but I'm fairly confident Wolfspell will not be my last game to use these dice.