Corporealization

Corporealization is the ability to become tangible, to form a solid, touchable body that can be felt. Some magical beings such as Ghosts/Spirits and a few demons have the power to corporealize and de-corporealize.

An example of a magical being with this power would be the invisible demon Troxa; when at room temperature he is invisible, but his ectoplasmic biochemical nature is sensitive to cold. Therefore he will become partially visible in a cooler climate. However, like all beings with this power he can force corporealization choosing to be either invisible or visible.

Another example of a magical being with this ability is Penny Halliwell. When summoned via the To Summon the Dead ritual, she in non-corporeal in the circle of candles, but if she steps out of the circle, she become corporeal and takes on her physical human form.