Prompto doesn't answer right away, rocking quietly on his heels.

"It's... a monster. Something that doesn't fit into the natural world. There's all different kinds, but they all... they're weak to light, so they materialize at night, and in dark places. And they're a lot stronger and meaner than normal wildlife. All they do is kill..."

He's quiet again, twisting his belt between his hands, and then adds, "Some of them used to be animals. Or people. Before they got infected."