Shadowcloak of Nocturnal for Followers
I am a vampire and I have the Shadowcloak of Nocturnal that allows me to automatically turn invisible when I sneak.
Is there a way I can teach this to my followers?
You can try to use this mod to enhance their stealth. You can't really make your companions invisible, but what you could try is using a command in the console to spawn a Shadowcloak of Nocturnal and making them equip it. However I can't find you the specific item code.