When an imprisonment spell is cast and the victim is touched, the recipient is entombed in a state of suspended animation (cf. temporal stasis) in a small sphere far below the surface of the earth. The victim remains there unless a reverse of the spell, with the creature's name and background, is cast. Magical search by crystal ball, a locate objects spell or similar means will not reveal the fact that a creature is imprisoned. The reverse (freedom) spell will cause the appearance of the victim at the spot he, she or it was entombed and sunk into the earth. There is a 10% chance that 1 to 100 other creatures will be freed from imprisonment at the same time if the magic-user does not perfectly get the name and background of the creature to be freed. The spell only works if the name and background of the victim are known.