[There's a long pause as she has to think about the best way to put it into terms that come close to human words.]

Our bodies return to the Earth to be consumed and turned into life. Your strength is given to those and the plants that take part in your final gift. The rest of your being is left to watch over those you love until you are called to roam the earth once more. Only those most pure and needed are gifted of a second life. It is a very honorable gift and very rare.