The dead need guidance. Filled with grief over their own death, they refuse to face their fate. They yearn to live on, and resent those still alive. You see, they envy the living. And in time, that envy turns to
anger, even hate. Should these souls remain in Spira, they become fiends
that prey on the living. Sad, isn’t it? The sending takes them to the
Farplane, where they may rest in peace.