Rite of Rune Carving[]
The Theurges (Godi) of the Get of Fenris are taught early on to respect and appreciate the power of runes. This rite allows them to carve th e runes that they can later cast. The runes must be carved into the bones of enemies slain in battle, and once dedicated, may never be lost by the Get. (See the Rite of Rune Casting).
Source: Get of Fenris Sourcebook