The Book of Blood is one the names for an Empyrean text which Nuhmudira possessed a copy of during Snowreap, 13 PY Nuhmudira owned a book titled Hanaureli Rezau, Yalaini for Letters of the Red Self. This Yalain name was a translation from the older and original Dericost, Inikshai Ardun, which translates to The Book of Blood.