A window into the nothing.

Your quigar's skull disappears, instead being replaced by a hollow hole, or no face at all.

• The presentation of this trait can vary widely and will be looked on a case-by-case basis.

ALLOWED:

• Revenants can apply this trait to bypass the subtype's requirement to have 50% or more of the skull intact.
• The skull itself can be almost entirely destroyed or missing when using this trait.

If you're unsure if your idea is valid, feel free to ask.