Govi are containers that the Loa sisters had used to seal up the Dark Souls in ancient times so that no form of evil could use it for themselves (i.e. Legion). Sealed by the most powerful voodoo, no Bokor or Mambo had proven sucessful in opening one to release the Dark Soul within. Mama Nettie had tried to do so, only to fail as well. As Shadow Man he is able to break open a Govi, and eventually the rest of them with a simple blast from his Shadowgun. Legion is believed to be just as capable, as some of the Dark Souls located in the Asylum are shown exposed, or already in the bodies of Trueforms.