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

They're the only major organ we are able to keep alive outside the host body.

Sometimes it only takes a few hours for the host body to be taken over.

In those times, his host body was that of an Unas.

She should never want to leave her Solarian host body!

"If the host body died, how much time would it have?"

The strength in her host body was almost used up.

They should catch on - for two host bodies were gone.

You could destroy the host body, but he would find another.

This seems to mean that the death guardian has found a new host body.