Maxwell can make magic tattoos

He pointed at my arm. “Who did the arma dei? It’s a little rough on the edges. The lines aren’t great.”
“Yeah,” I said. “I did it myself five years ago.”
Weiss wrinkled his brow. “You know enough to come to me, but you tried to do one of these yourself?”
“It was a rush job. I didn’t have time to consult an expert.”

Excerpt From Ex-Communication, pg 228
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546