VF Rune, Sanger

The birth control rune is a new form of contraceptive among Shadowhunters, created by Clary Fairchild—the only Shadowhunter able to "create" runes. It was initially controversial upon its creation some time after 2007 but has since become one of the most-used runes.[1] The rune's effectiveness lasts about three months, much like birth control shots among mundanes.[2]