The character draws the soul from a newly dead body and imprisons it in a gem. The subject must have been dead no more than 1 round per caster level. The soul, once trapped in the gem, cannot be returned through clone, raise dead, reincarnation, resurrection, true resurrection, or even a miracle or a wish. Only by destroying the gem or dispelling the spell on the gem can one free the soul (which is then still dead).
Focus: at least 1,000 gp value for every Hit Die possessed by the creature whose soul is to be bound.