They have no corporeal form, and thus must take a host body.

Then Avelyn felt the weight of a corporeal form again.

Later, she is allowed to occasionally take corporeal form among the living.

The thing was light and dark and without corporeal form.

God is a title for once mortal or in corporeal form (spirit within a body).

The corporeal form you knew as my body has long since rotted away.

It was not possible yet; he could only operate in corporeal form.

He once had a corporeal human form, but now appears as a floating head in an energy tube.

He hesitated, though, and stayed clear of his corporeal form.

Also, like my own intelligence, it may be unable to appear in corporeal form.