Incorporeal Form

When manifested fully, as a standard action, you can make a Will saving throw (DC 15) to become incorporeal for 1 round. If you revert to being manifested fully in a material object (such as a solid wall), you are shunted off to the nearest open space and take 1d6 points of damage per 5 feet that you so travel.

A ghost without this feat is normally incorporeal, but is manifested fully within the borders of the Manifest Ward and cannot overcome the effect without magic.

You can become incorporeal even when you would otherwise be forced to manifest fully.