The worst thing he can do is prey upon those who have lost loved ones. ...he convinces them that he can bring their loved ones back from the dead, and with their assistance, he binds the deceased soul into a puppet, forces them to kill the one who loved them too much to know any better, and then makes them fight in his war to destroy the entire human race. Their souls decay and eventually rot away to nothing in his captivity.
[they all want to be informed, but he feels so terrible informing them] ...I'm sorry.