It's a fantasy role-playing game.

DM: You are Caleb Widogast, a human wizard . You are the member of the famous group of adventurers. Previously, Before impacting to the ground of one of the top chambers of the pyramid. Looking within the interior of this five-sided chamber, you noticed amongst the two pillars to the side a raised platform where there was a fountain of some kind, surrounded by three of these mostly-humanoid but snake-scaled, covered in places, yuan-ti people.
DM: All right. (hisses) towards you, its fangs bared. That ends your go, Jester. Caleb and Caduceus, you guys are up at the same time.
Player: I was rummaging in my pockets for the molasses, but everybody is dropping, so instead I pull out a burned twig and hold my hand out and cast Witch Bolt at 3rd-level through the twig towards snakeman.
DM: Ooh! All righty. Roll for attack.
Player: That is a 21.
DM: That'll hit.
Player: Okay, so that's 3d12, which I have never used in my life. I think it's this one. The fuck is that?! That's an 11. Plus six is 17. 25 lightning damage.
DM: Nice!
Player: Which I did from the ground, I guess, so I will stand up now. Am I within five feet of that guy?
DM: You are, yes.
Player: Hey, I'm going to run for it. I'm going to go toward that pillar there.
DM: Over here?
Player: Yeah.
DM: (counting) 25. As you rush by, its snake head cranes around and extends out to bite towards the side of your shoulder and arm as you rush past.
