Changes

The Mark of Cain was a lock designed by [[God]] for [[the Darkness]]. He originally gave it to [[Lucifer]] who passed it onto [[Cain]] and from there to Dean. It was the first [[curse]] in existence and the source of power for [[the First Blade]].<ref name="ten17">[[10.17 Inside Man]]</ref> [[Amara]] , being the original Mark, bears it on her shoulder where it appears as a birth mark or a scar unlike with Cain and Dean, where it appeared on their forearms as a brand.