Such as soul bottles as outlined in Lovecraft or related grimoires (such as Donald Tyson & Asenath Mason). Has anyone tried their methods and had actual success, or is it supposed to be taken less literally? Alternatively, are soul bottles a thing in necromancy? I’ve tried Googling but the results have been overtaken by Skyrim and D&D links.
Not that I’m planning to do it, just curious about possible methods. I know that it is possible, e.g. kumantongs (amulet made with a fetus) which are quite popular, but the monks won’t disclose the method to outsiders.