Ghostly Visage needs a caster level if it can be dispelled. I suggest caster level = character level, as making it equal to PrC level is too low. Class features aren't done. Mobility is good, intimidate can be useful but many things are immune to it (Undead, Mind Blank'd folks, Oozes) and others are pretty resistant. Intimidate by itself is kind of lackluster but there exist feats, skill tricks, items, PrC's, etc which make it quite scary. What else will the class do? Teleports as a swift action can be pretty scary, Inescapable might let them piggy back on teleports (which can be a very brave/stupid thing to actually do) or serve as a Dimensional Anchor type thing. We'll see when all the features are up.