How Maxwell became a ghost

“You all know I had my Sativus medallion that let me transform into Cairax. He’s a demon from the Abyss and I was hijacking his body every time I put the medallion on. This is the kind of thing that can get you into trouble in the long run, so I had some backups installed.”
“Installed where?” asked Danielle.
“On me. That’s what a lot of my tattoos were. They were wards and guards to make sure Cairax couldn’t get me after I died. Being dead was my safe house, if you like.” The speakers crackled like a potato chip bag. “Demons can’t affect the dead unless said dead person falls into their sphere of influence—if they’re going to hell. Otherwise, they can’t touch you.”
…
“What I didn’t count on was the ex-virus. The idea that my body could die and still be walking around on its own. All my preparations sort of jammed up and I got trapped in there for a year or so until George destroyed my physical body.”

Excerpt From Ex-Communication, pg 205-206
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546