Contains mordite

"Deathstone, huh?" Thomas said. "It sort of looks like someone spray-painted a soap bubble. And gave it tentacles."
"It isn't a soap bubble," I said. "There's a solid piece inside. The energies it carries in it are what create that shroud effect around it."
Thomas poked a finger at it. "What does it do?"
I caught his wrist before he could touch it, and pushed his hand away. "It kills. Hence the name deathstone, you half-wit."
"Oh," Thomas said, nodding with drunken sagacity. "It looked cool when it gacked that little thing, but so what? It's a bug zapper."
"If you disrespect this thing it's going to get you killed," I said. "It would kill anything living exactly the same way. Anything. It's not from our world."
"It's extraterrestrial?" asked Susan.
"You do not understand, Miss Rodriguez," Ortega said quietly. "Mordite is not from this galaxy or this universe. It is not of our reality."
I had reservations about Ortega's presence on the home-team roster, but I nodded. "It's from Outside. It's - congealed antilife. A chip of this stuff makes nuclear waste look like secondhand smoke. Being near it draws the life off you bit by bit. If you touch it, it kills you. Period."
"Precisely," said the Archive. She stepped forward to look at both Ortega and me. "An enchantment binds the particle in place. It is also sensitive to applied will. The duelists will face each other, the mordite between them. Will it toward your opponent. He with the greatest force of will controls the mordite. The duel will end when it has devoured one of you."
Gulp.


Death Masks Chapter 29, Page 261-262