St George crushing Cairax’s medallion

The thought crossed his mind in an instant. The hero threw off the exes holding his arm. He tore the medallion away and sparks popped against the monster’s purple hide as the silver links snapped.
Cairax Murrain twitched and pointed a talon at him. Then it trembled, opened its monstrous, sagging jaw, and collapsed in on itself in a swirl of dark flames and smoke.
In the demon’s footprints stood an ex with a mop of black hair and a library of tattoos across its yellowed flesh. Pentagrams, long lines of Latin, and scores of Egyptian hieroglyphics. The heavy collar hung like a huge ring on the dead man’s neck. The naked ex staggered and closed its mouth with a solid clack, then looked down at its tiny limbs. The thing behind its eyes looked confused.
"I'd explain what just happened," said St George, "but I'd hate to ruin the trick for you."
The medallion let off a few black sparks as he crushed it between his fingers.

Excerpt From Ex-Heroes, pg 447-448
Peter Clines
https://books.apple.com/us/book/ex-heroes/id585738407