As iron is eaten away by rust, so the envious are consumed by their own passion. — Antisthenes
Ever want something so badly it becomes the only thing you can think about? You’re obsessed. The origin of the word obsess come dates from middle English meaning haunted. That seems appropriate, that we are haunted by something we can’t let go of, just as a ghost may be unwilling to let go of this world. That obsession may drive you forward to reach new heights. Or it may be the very thing consumes you.
What is your character’s obsession? What is something that consumes their thoughts? That haunts them?
Where does that obsession lead them?