The fourteenth rune of the Elder Futhark. When people speak of the invented “blank rune” from Blum, I always laugh: why is such a thing needed in a cast when we have Perthro? Perthro represents the unknown and unknowable, that piece that’s left up to fate or chance when we roll a die (or cast the runes). Whether it’s for a game or in life, Perthro is luck and risk and mystery. The things that make us wonder why it goes the way it will or went the way it did. It is unpredictable factors, but it is also our intuition and our willingness to roll the dice and play.