Note that New Coke here is an IVORY devil, not a PALE devil. This is, as far as we know, an entirely new form of devil.

IIRC, devils are formless black flame, Masked by mortal sorcerers. The masks give the devils their forms and nature. Cio WAS her mask in many ways. Without it, she's just formless chaotic black flame.

It's possible that this Ivory Devil form is what you get when a devil is able to pull themselves into a body without a mask at all.