Assume form

Transforms one person into the shape that the component is derived from, it can be an ear, lock of hair, spot of blood or anything from them. Only true-sighted creatures can see through this illusion and does change the voice and scent of the user.

Should the caster or user want to disregard the illusion all they should do is say ‘illusion, off.’ However it only stops the illusion of the person who says that and not everyone’s, unless the caster is the one who says it.