“A weapon,” he said.  “A… how do you Americans say it?  Time bomb?  Only this is joke.”

“He makes portals,” Kismet said.  “Using them, he can send things back in time.  Something goes in portal B, comes out of portal A a few minutes earlier.  Or the other way around.”

“Or, as I discover, I make loop,” Phir Sē said.  “Weaponize.  Simple light, captured in one moment, redoubled many times over.  I move gate, and that light will pour forth and clean.”

Wildbow, Worm, 24.3