This spell snatches the soul of a humanoid as it dies and traps it inside the lantern you use for the material component. A stolen soul remains inside the cage until the spell ends or until you destroy the cage, which ends the spell.  You can use a trapped soul up to six times. Once you exploit a soul for the sixth time, it is released, and the spell ends. While a soul is trapped, the dead humanoid it came from can’t be revived.

A creature that can see the sensor (such as one using see invisibility or truesight) sees a translucent image of the tormented humanoid whose soul you caged.