F3 Critters

"Critters?" I asked.
"Yep, critters." Jack did not clarify.

"What do you mean by that?"
"I mean all the supernatural things out there. You know, vampires, werewolves, faerie, elves, wights. All the things that are in the world, but don't follow what we like to think of as normal rules. Some would say we're a part of it."
"Okay, so what about them?"
"Thing is there are rules about killing them."
"We're not allowed to?"
"Oh, hell yes we're allowed to. No, what I mean is it's not always simple. Most of them have specific things that can kill them. You can't just zap 'em with lightning and call it a done deal. This is where the Pyros have one up on us. Fire hurts most of 'em. The Hosers don't have it too bad, either. Running water does something to a few of them. We're out of luck in terms of specialized weapons. Lightning will hurt, but it's not a guaranteed kill, so you need to be careful."
"How about dropping them from twenty thousand feet?"
"It'll slow 'em down."