To cast a spell with a somatic component, she must have humanlike hands. To cast a spell with a material component or focus, she must have the materials or focus. Yes The character creates a destructive resonance in a corporeal creature's body. For each round the character concentrates, the character causes one creature to collapse in on itself, killing it. The character can target a particular creature only once with each casting of the spell.
Implosion has no effect on creatures in gaseous form or on incorporeal creatures.
The subject remains there unless a freedom spell is cast at the locale where the imprisonment took place. Magical search by a crystal ball, a locate object spell, or some other similar divination does not reveal the fact that a creature is imprisoned, but discern location does. A wish or miracle spell will not free the recipient but will reveal where it is entombed. The imprisonment spell functions only if the target's name and some facts about its life are known. As invisibility, except the spell doesn't end if the subject attacks.