What happens to a celestial when its vessel is possessed?
The celestial’s mind is tossed into the Marches. If it has another vessel it can use, it can get back to earth with that one. A Kyriotate who has no other vessel assumes its Celestial form (p. 102). Shedim are evicted and must find a new host quickly (p. 152). When the duration of Possession is over, the mind of the celestial is drawn back to its vessel as long as it is still in the Marches (or it can choose to let the vessel vanish). If it is elsewhere, the vessel vanishes.
