The "blank" rune, or "Wyrd rune," was added to the classic Futhark by Ralph Blum as the 25th rune, but it is a modern invention that doesn’t belong to the original structure. This addition is unnecessary, as the Elder Futhark is already a perfect and self-contained system. However, in modern divination, the "fate rune" has gained popularity and is sometimes used in readings.
The Northern Tradition school rejects the blank rune, as it disrupts the balanced design of the Elder Futhark, which could mislead the practitioner. For ancient Scandinavians and other pagans, belief in fate (wyrd) was absolute, and every rune in a reading was seen as a manifestation of fate. The Perthro rune already represents fate, so there’s no need for another.

Ksenia Menshikova