It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, Pike realizes she has seen this place in a vision, as well as a cavern of blue crystal beyond it. They decide to cross it.
DM: 47 points of damage. Oof. So as you rush past, you (swoosh) slam the blade into the side. You see where part of it seems to start and open, but it's starting to close up again. You reopen that seam and drag across, leaving a giant wound across its side.
Player: Okay, and then with that knife in, I'm going to stick the other knife in and attempt to attack it and then drag it to the ground. Grapple it to the ground with my body as I attack. Second attack is a 25.
DM: 25 hits.
Player: Okay. That's seven.
DM: Are you doing damage, or you grappling him?
Player: I'll grapple.
DM: Okay, so there's no damage on this. Go ahead and make an athletics check.
Player: Okay. 20. Natural 20. (all cheer)
DM: Nice! So you grab it, and you pull it. You have it currently held. Its physical body is pulled to the ground, and you can see its arms are trying to pull it up off the ground, and (slurpy noises) flipping around. Complete chaos in the air. You imagine you'll probably have a hard time holding it down, but for now it's currently blinded and grappled.
Player: With haste, I have a third attack.
DM: You do.
Player: I'm going to drag across its throat. That is a 25.
DM: That hits.
Player: And that's seven.
DM: You don't get the bonus-- oh, for the extra attack you do, because it's with your main arm. So, seven damage? All right. Cool. You bring the blade across, and you can see the blood begin to pour out from it, and as it does, you can see the throat opens up, and where you cut on the throat you can see what looks like white gleaming teeth on the inside of its throat. The entire interior of its trachea is coated with teeth.
