Cleon
Legend
Updated with natural invisibility.
For the "nightmare illusion", is it going to be some combination of mirror image, simulacrum, and maybe frightful presence or another fear spell/ability?
I was thinking the "Nightmare" would be similar a combination of the project image, phantasmal killer, shadow conjuration and shadow evocation spells.
It will probably be necessary to split it into several supernatural powers - say, a "Manifest Nightmare" special attack for the shadow conjuration/evocation effect and a "Phantasmal Projection" special quality for the project image/simulacrum effect, plus some kind of "Aura of Terror" for the fear.