Talk:Evileye/@comment-2A02:A03F:4AC5:E800:89AD:FDC7:1993:D7CB-20180607114741/@comment-45.56.46.26-20180609092152

The ring prevents magical detection of her as an undead (and any magical detection further specific to vampires, maybe), it doesn't change her appearence.

Though if you think of "form" as including abilities as well as appearence, then Evileye also hides her vampire abilities, including her trump card (which is apparently unique to her, but still indicative of being a vampire).

I don't know whether she'd have to remove the ring (or her mask) to use her trump card, but there are a few vampire abilities (particularly those related to eyes and fangs) which she clearly can't use while wearing her mask.

On the subject of Shalltear, it's interesting that she'd be able to have an additional form just by having her appearence customized. In other words, if it were just customizing her appearance then she should have her custom appearance despite being a lamprey "underneath". So it must be that True Vampires have the ability to disguise themselves as more humanlike, and it was her disguised appearance that was customized (the same as with Narberal, Solution, Lupusregina, and Entoma).