“Envy demons are equal parts arrogance and cowardice. They isolate their victims to study them at length, seeking to become them. Once the demon is satisfied it knows its chosen subject, it takes on their form, leaving the poor soul to rot. Envy is never satisfied, however. The demon’s bottomless cravings to be more—more powerful, more skilled, more inspired—cause it to seek fresh prey, leaving a trail of stolen identities behind.”