The Shield of Mylitta

The Shield of Mylitta: This simple ritual chant is 100% effective, 100% reversible birth control. Effective only on the mage, it renders them incapable of impregnating or becoming pregnant, until it is reversed by chanting the same words in reverse order. The Blessing of Inuus supersedes the Shield of Mylitta. This spell will not function on a mage who has cast the Blessing of Inuus on himself, and casting the Blessing of Inuus will end this spell.