Cairax can be beaten by symbolism

“Max sighed. “Okay, in simple terms, if the demon believes it can be hurt, and we believe we can hurt it, it’ll be hurt. It’s like Jung on steroids. That’s why all the big symbols are so important. It’s the same reason silver bullets have been able to kill werewolves ever since Siodmak wrote the Wolf Man screenplay.”
…
“Okay, you know how you can be in the Matrix and even though you know it’s all just in your mind…the injuries will still translate through to the real world because the illusion is so perfect. The sights, the sounds, the feelings—no matter what you know, your mind can’t deny all the information coming in. Belief trumps knowledge, like a psychosomatic injury.”
...
St George looked at Max. "Symbols are important, right? I'm the guy who beat him before, so maybe it'll remember me and be a little scared or something. It might give me an edge."
"It will," said Max. "Not much, but it'll help."

Excerpt From Ex-Communication, pg 419-420
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546