They have a "costume" to look like a mortal (when they don't have the horns) to walk around the mortals, when they have the horns that means that they're in their normal form, as a demons they are. You can also check this one about Shadow/Tenebrae forms: https://inkbunny.net/submissionview.php?id=1045312
They have a "costume" to look like a mortal (when they don't have the horns) to walk around the mort
